Journal of Luminescence最新文献

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Unraveling the Multi-sensing mechanism of 2-(2′-Hydroxyphenyl)-benzothiazole fluorescent probes for acetylcholinesterase detection 揭示用于乙酰胆碱酯酶检测的 2-(2′-羟基苯基)-苯并噻唑荧光探针的多重传感机制
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-09-02 DOI: 10.1016/j.jlumin.2024.120874
{"title":"Unraveling the Multi-sensing mechanism of 2-(2′-Hydroxyphenyl)-benzothiazole fluorescent probes for acetylcholinesterase detection","authors":"","doi":"10.1016/j.jlumin.2024.120874","DOIUrl":"10.1016/j.jlumin.2024.120874","url":null,"abstract":"<div><p>The efficient design of dual-sensing mechanisms for fluorescent probes holds significant implications for real-time monitoring of acetylcholinesterase (AChE) under oxidative stress. In this study, we employed density functional theory (DFT) and time-dependent density functional theory (TD-DFT) to investigate the fluorescence detection mechanisms of 2-(2-hydroxyphenyl)benzothiazole derivatives <strong>SNCN-AE</strong> and <strong>SNC-AE</strong>. We proposed a fluorescence detection method based on the mechanisms of excited-state intramolecular proton transfer (ESIPT) and photo-induced electron transfer (PeT). Computational results indicate that the fluorescence quenching of <strong>SNCN-AE</strong> and <strong>SNC-AE</strong> results from the typical PeT process initiated by the dimethyl carbamate ester moiety. Upon reaction with the AChE, the electron donor is replaced by the hydroxyl group, and the PeT is suppressed. The redshift of emission wavelength arises from the ESIPT process rather than the ICT mechanism, as evidenced by the absence of charge transfer phenomena in the computed frontier molecular orbitals. This study provides a novel insight for the further development of fluorescence probes in the field of biomedicine, based on the PeT-ESIPT mechanism regulation.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermally stimulated luminescence of UV-irradiated YAlO3:Bi perovskite 紫外线辐照下 YAlO3:Bi 包晶的热刺激发光
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-09-02 DOI: 10.1016/j.jlumin.2024.120875
{"title":"Thermally stimulated luminescence of UV-irradiated YAlO3:Bi perovskite","authors":"","doi":"10.1016/j.jlumin.2024.120875","DOIUrl":"10.1016/j.jlumin.2024.120875","url":null,"abstract":"<div><p>The appearance of the ultraviolet Bi<sup>3+</sup>-related emission band in the thermally stimulated luminescence (TSL) spectrum is observed around 465 K after selective irradiation of the YAlO<sub>3</sub>:Bi perovskite in the Bi<sup>3+</sup>-related absorption bands. The excitation spectrum of the TSL glow curve peak at 465 K, activation energies of its creation by photons of different energies, and the dependence of the TSL peak intensity on the irradiation duration are measured. The origin of the optically created electron centers and the mechanisms of photostimulated creation of the electron and hole centers under irradiation in the Bi<sup>3+</sup>-related absorption bands of YAlO<sub>3</sub>:Bi are discussed. The TSL glow curve peak at 465 K is suggested to appear as a result of electrons release from the electron centers intrinsic to the YAlO<sub>3</sub> lattice and their recombination with the hole Bi<sup>4+</sup> centers. The same processes are shown to take place in the X-ray-irradiated YAlO<sub>3</sub>:Bi perovskite. The obtained results are important for possible applications of the investigated material in thermoluminescent dosimetry.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Scintillation and dosimeter properties of Tb-doped strontium fluoride transparent ceramics 掺铽氟化锶透明陶瓷的闪烁和剂量计特性
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-31 DOI: 10.1016/j.jlumin.2024.120868
{"title":"Scintillation and dosimeter properties of Tb-doped strontium fluoride transparent ceramics","authors":"","doi":"10.1016/j.jlumin.2024.120868","DOIUrl":"10.1016/j.jlumin.2024.120868","url":null,"abstract":"<div><p>Luminescence properties of strontium fluoride transparent ceramics with various TbF<sub>3</sub> amounts (0.1, 0.5, and 1 %) were investigated. Scintillation peaks derived from the electronic transitions between 4f levels in Tb<sup>3+</sup> were observed. The observed scintillation decay times of approximately 8.3 ms were typical for the electronic transitions in Tb<sup>3+</sup>. Furthermore, the Tb-doped strontium fluoride transparent ceramics showed thermoluminescence and optically stimulated luminescence (OSL) with Tb<sup>3+</sup> serving as the recombination center. The most intense thermoluminescence signal was detected from the 0.1 % Tb-doped transparent ceramic within the range of 0.01–100 mGy. OSL stimulated by 600 nm light of the same material was the most intense, and its lowest detectable limit was about 100 mGy.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0022231324004320/pdfft?md5=e67817d81e96429accada438d6896e71&pid=1-s2.0-S0022231324004320-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142130159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Circularly polarized (CP) green-light of two chiral Zn(II)-Tb(III)-Salen heterobinuclear enantiomers 两种手性 Zn(II)-Tb(III)-Salen 异核对映体的圆偏振 (CP) 绿光
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-31 DOI: 10.1016/j.jlumin.2024.120871
{"title":"Circularly polarized (CP) green-light of two chiral Zn(II)-Tb(III)-Salen heterobinuclear enantiomers","authors":"","doi":"10.1016/j.jlumin.2024.120871","DOIUrl":"10.1016/j.jlumin.2024.120871","url":null,"abstract":"<div><p>Despite the appreciable high color-purity green-light of chiral Tb<sup>3+</sup>-complexes, it remains a great challenge to enable their both high quantum efficiency and large circularly polarized light (CPL) activity. Herein, through the self-assemble of the chiral Salen-type <em>bis</em>-Schiff-base ligand <strong>(S,S)-H</strong><sub><strong>2</strong></sub><strong>L</strong> or <strong>(R,R)-H</strong><sub><strong>2</strong></sub><strong>L</strong> with Zn(OAc)<sub>2</sub>·2H<sub>2</sub>O and Ln (NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O (Ln = La, Tb, Gd), two series of chiral Zn(II)-Ln (III)-heterobinuclear enantiomers [Zn ((S,S)-L)Ln (<em>μ</em><sub>1</sub>-OAc)(<em>μ</em><sub>2</sub>-NO<sub>3</sub>)<sub>2</sub>] (Ln = La, <strong>1</strong>; Tb, <strong>2</strong>; Gd, <strong>3</strong>) or [Zn ((R,R)-L)Ln (<em>μ</em><sub>1</sub>-OAc)(<em>μ</em><sub>2</sub>-NO<sub>3</sub>)<sub>2</sub>] (Ln = La, <strong>4</strong>; Tb, <strong>5</strong>; Gd, <strong>6</strong>) were afforded, respectively. Photophysical study shows that the destabilized <sup>3</sup>π-π* energy level upon Zn<sup>2+</sup> coordination, is confirmed to effectively sensitize of the Tb<sup>3+</sup>-centered green-light for the two chiral complexes [Zn ((S,S)-L)Tb (<em>μ</em><sub>1</sub>-OAc)(<em>μ</em><sub>2</sub>-NO<sub>3</sub>)<sub>2</sub>] (<strong>2</strong>) and [Zn ((R,R)-L)Tb (<em>μ</em><sub>1</sub>-OAc)(<em>μ</em><sub>2</sub>-NO<sub>3</sub>)<sub>2</sub>] (<strong>5</strong>). The merits of efficient (<span><math><mrow><msubsup><mi>Φ</mi><mtext>Tb</mtext><mi>L</mi></msubsup></mrow></math></span> = 5.6–6.2 %) Tb<sup>3+</sup>-centered green-light and strong CPL activity (|<em>g</em><sub>PL</sub>| = 0.03, <sup>5</sup>D<sub>4</sub>→<sup>7</sup>F<sub>3</sub> transition), engender chiral Zn(II)-Tb(III)-Salen complexes like <strong>2</strong> and <strong>5</strong> a new platform to ideal chiral organo-Tb<sup>3+</sup> candidates.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient fluorescence quenching and low-limit detection of HIV-1 DNA via morphology controlled ZIF-8 crystals 通过形态可控的 ZIF-8 晶体实现 HIV-1 DNA 的高效荧光淬灭和低限检测
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-30 DOI: 10.1016/j.jlumin.2024.120867
{"title":"Efficient fluorescence quenching and low-limit detection of HIV-1 DNA via morphology controlled ZIF-8 crystals","authors":"","doi":"10.1016/j.jlumin.2024.120867","DOIUrl":"10.1016/j.jlumin.2024.120867","url":null,"abstract":"<div><p>ZIF-8 (zinc-methylimidazolate framework-8) has shown promising applications as a fluorescence sensing platform, particularly in fluorescence quenching sensors for various biological and chemical analyses and detections. However, the impact of the morphology of ZIF-8 crystals on their performance of biomolecule detection, especially DNA detection, remains to be explored. In this study, six types of ZIF-8 crystals with different morphology (cubic, rough octahedral, flakes, rhombic, dodecahedral, and hexapod) are successfully synthesized by incorporating different concentrations of the surfactant/end-capping agent, namely cetyltrimethylammonium bromide (CTAB) and/or tris(hydroxymethyl)aminomethane (TRIS). These crystals are characterized in terms of morphology, crystal structure, specific surface area, and electrostatic adsorption capacity. Subsequently, these morphologically different ZIF-8 crystals are combined with fluorophore carboxyfluorescein (FAM)-labeled single-stranded DNA (ss-DNA) to form FAM-DNA@ZIF-8 biosensor. Then, their fluorescence quenching efficiency is characterized by using the fluorescence spectroscopy. The measurement results show that, due to its higher external specific surface area and zeta potential thereby higher electrostatic adsorption capacity, the cubic ZIF-8 crystal can effectively capture more FAM-DNA molecules through the electrostatic adsorption and achieve high fluorescence quenching efficiency via the fluorescence resonance energy transfer mechanism. Thus, the fluorescence quenching efficiency of the cubic FAM-DNA@ZIF-8 reaches up to 98.1 %. Finally, the cubic FAM-DNA@ZIF-8 biosensor is used to detect the complementary target HIV-1 DNA via the fluorescence recovery. The experimental results show that the fluorescence recovery efficiency of the FAM-DNA@ZIF-8 reaches up to 40.8 upon the addition of complementary target ssDNA, significantly higher than the recovery efficiency when non-complementary target DNA is introduced. Also, both fluorescence quenching efficiency and recovery efficiency of the cubic FAM-DNA@ZIF-8 are much higher than those of the reported biosensors based on ZIF-8 crystals with non-optimal morphology. Additionally, the fluorescence recovery sensitivity of the biosensor is 0.536/(nM⋅mL), with a detection limit as low as 1.37 nM. In addition, its detection performance remains almost unchanged after ten days of storage. These findings provide valuable insights for optimizing ZIF-8-based DNA biosensor.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142094996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of hybrid nanoscatterer for enhancing light efficiency of quantum dot-converted light-emitting diodes 用于提高量子点转换发光二极管光效的混合纳米散射器研究
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-30 DOI: 10.1016/j.jlumin.2024.120869
{"title":"Study of hybrid nanoscatterer for enhancing light efficiency of quantum dot-converted light-emitting diodes","authors":"","doi":"10.1016/j.jlumin.2024.120869","DOIUrl":"10.1016/j.jlumin.2024.120869","url":null,"abstract":"<div><p>Optical scatterer additives play a critical role in enhancing the light conversion efficiency and uniformity of quantum dot-converted light-emitting diodes (Qc-LEDs). This study investigates the impact of optical characteristics and morphology of nanoscatterer on the light conversion and extraction efficiency of Qc-LEDs. Various metal oxides and boron nitride nanoparticles and nanoplates with different diffraction index were selected to carry out the study. Finite-Difference Time-Domain (FDTD) simulation was employed to evaluate the scattering effect of various nanosphere and nanoplate scatterers on the optical performance of the Qc-LEDs. The simulation results revealed that the hybrid nanoscatterer integrates the forward-scattering from the nanosphere and backward-scattering of blue light from the nanoplate. Spectral analysis was conducted to examine the optical performance of Qc-LEDs with varying combinations and concentrations of nanoscatterers. TiO<sub>2</sub> nanoparticles and Al<sub>2</sub>O<sub>3</sub> nanoplates were found to be the best combination for maximal light conversion and extraction efficiency within Qc-LEDs. The results indicate an optimal light efficiency is obtained with the optimal ratio of 1:2:2 for quantum dots, TiO<sub>2</sub> nanoparticles, and Al<sub>2</sub>O<sub>3</sub> nanoplates. These findings reveal the relationship between optical properties, morphology, and light conversion efficiency in Qc-LEDs, highlighting the advantages of the hybrid nanoscatterers for improving optical performance of Qc-LEDs.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142094997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced optical gain assisted by the plasmonic effects of Au nanoparticles in Nd³⁺ doped TeO₂-ZnO waveguides produced with the pedestal architecture 掺杂钕⁺的 TeO₂-ZnO 波导中的金纳米粒子的等离子效应增强了光增益,这种波导是用基座结构制作的
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-29 DOI: 10.1016/j.jlumin.2024.120865
{"title":"Enhanced optical gain assisted by the plasmonic effects of Au nanoparticles in Nd³⁺ doped TeO₂-ZnO waveguides produced with the pedestal architecture","authors":"","doi":"10.1016/j.jlumin.2024.120865","DOIUrl":"10.1016/j.jlumin.2024.120865","url":null,"abstract":"<div><p>Investigation of the signal enhancement of Nd<sup>3+</sup> codoped TeO<sub>2</sub>-ZnO pedestal waveguides, at 1064 nm, due to Au nanoparticles deposited over the core is presented for the first time. Nd<sup>3+</sup> doped TeO<sub>2</sub>-ZnO thin film was obtained by RF Magnetron Sputtering deposition. The resulting core with 500 nm height and widths in the 4–40 μm range, exhibited low roughness average in all area measured (0.48 ± 0.04) nm. Minimum propagation losses of 2.2 dB/cm were observed for waveguide width of 40 μm whereas an increase took place for smaller ones. Scanning electron microscopy (SEM) allowed the waveguide structure inspection and transmission electronic microscopy (TEM) the Au nanoparticles evaluation. The results showed that the Au nanoparticles contributed up to 75 % of relative gain enhancement, under 808 nm excitation. This increase was due to the local field growth in the proximity of the nanoparticles that enhances the density of excited Nd<sup>3+</sup>. The internal gain that considers the propagation losses reached positive values for larger core widths (above 8 μm).</p><p>The present study opens possibilities for optical amplifiers with low propagation losses based on different metal-dielectric composites, as well as other waveguide-based devices.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142122967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Manganese doping in zinc based hybrid metal halides to realize highly stable efficient green emission and flexible radiation detection 在锌基杂化金属卤化物中掺入锰,实现高稳定高效的绿色发射和灵活的辐射探测
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-28 DOI: 10.1016/j.jlumin.2024.120862
{"title":"Manganese doping in zinc based hybrid metal halides to realize highly stable efficient green emission and flexible radiation detection","authors":"","doi":"10.1016/j.jlumin.2024.120862","DOIUrl":"10.1016/j.jlumin.2024.120862","url":null,"abstract":"<div><p>Extensive studies have been conducted on hybrid metal halides due to their application in radiation detection, solid-state lighting, and solar cells. Here, we present an environmentally friendly zero-dimensional halide, (C<sub>9</sub>H<sub>15</sub>N<sub>3</sub>)ZnBr<sub>4</sub>, which crystallizes in the <em>P</em>2<sub>1</sub>/<em>c</em> space group. This compound is highly thermally stable, and doping Mn<sup>2+</sup> results in a bright green light emission, with an impressive internal quantum efficiency of 52.9 % and an external quantum efficiency of 45.9 % for (C<sub>9</sub>H<sub>15</sub>N<sub>3</sub>)Mn<sub>0.3</sub>Zn<sub>0.7</sub>Br<sub>4</sub>. Combining spectroscopic analysis with first-principles density functional theory (DFT), it is concluded that the high external quantum efficiency arises from efficient energy transfer from the organic component to the [MnBr<sub>4</sub>]<sup>2-</sup>. Notably, the (C<sub>9</sub>H<sub>15</sub>N<sub>3</sub>)Mn<sub>0.3</sub>Zn<sub>0.7</sub>Br<sub>4</sub> luminescence intensity maintains 50 % of its room temperature level even at 400 K. Moreover, these doped powders display exceptional scintillation performance, higher than Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub>. Finally, the radioluminescence intensity of (C<sub>9</sub>H<sub>15</sub>N<sub>3</sub>)Mn<sub>0.3</sub>Zn<sub>0.7</sub>Br<sub>4</sub>@polydimethylsiloxane flexible films is about three times that of Bi<sub>4</sub>Ge<sub>3</sub>O<sub>12</sub>. These features position Mn:(C<sub>9</sub>H<sub>15</sub>N<sub>3</sub>)ZnBr<sub>4</sub> as an ideal material for X-ray detection and an efficient green photoluminescent material.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring excited state dynamics in benzocarbazole derivatives through transient absorption spectroscopy 通过瞬态吸收光谱探索苯并咔唑衍生物的激发态动力学
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-27 DOI: 10.1016/j.jlumin.2024.120864
{"title":"Exploring excited state dynamics in benzocarbazole derivatives through transient absorption spectroscopy","authors":"","doi":"10.1016/j.jlumin.2024.120864","DOIUrl":"10.1016/j.jlumin.2024.120864","url":null,"abstract":"<div><p>Increasing the spin-orbit coupling (SOC) constant by introducing heteroatoms is crucial approach for achieving efficient pure organic room-temperature phosphorescent (RTP). This research focused on the molecules 3,3″-Di(9H-carbazol-9-yl)-1,1':3′,1″-terphenyl (DCzTp) and 2,6-Bis[3-(9H-carbazol-9-yl)phenyl]pyridine (DCzPPy) using transient absorption spectroscopy experiments. For DCzTp, the femtosecond spectroscopy revealed an excited state absorption (ESA) signal at 630 nm, which reached a maximum within 1.3 ps, followed by decay of the ESA signal and appearance of triplet-triplet absorption (TTA) signal at 405 nm. An isosbestic point at 465 nm indicated the presence of intersystem crossing (ISC). In nanosecond spectroscopy, the TTA signal reached its maximum within 23 ns, and then the triplet state lifetime (τ<sub>TTA</sub>) decayed within 1.9 μs. DCzPPy exhibited faster ISC lifetime (τ<sub>ISC</sub> = 5.5 ns) and longer τ<sub>TTA</sub> (4.9 μs) compared to DCzTp. Theoretical simulations demonstrated that DCzTp transitions from the lowest singlet excited state (S<sub>1</sub>) to the lowest triplet excited state, while DCzPPy transitions from S<sub>1</sub> to the higher triplet excited state (T<sub>2</sub>). Notably, due to the heteroatom effect, the SOC constant of DCzPPy (0.27 cm<sup>−1</sup>) was greater than that of DCzTp (0.23 cm<sup>−1</sup>), leading to a faster τ<sub>ISC</sub> (5.5 ns vs. 11.4 ns). Additionally, DCzPPy exhibited an additional triplet state internal conversion process (1.1 μs), leading to a longer τ<sub>TTA</sub> (4.9 μs vs. 1.9 μs). This research provides valuable insights into how heteroatoms enhance RTP efficiency in pure organic molecules.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142088862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical thermometry using efficient upconversion luminescence in Er3+ self-sensitized NaYS2 under multi-wavelength excitation 在多波长激发下,利用 Er3+ 自敏化 NaYS2 中的高效上转换发光进行光学测温
IF 3.3 3区 物理与天体物理
Journal of Luminescence Pub Date : 2024-08-26 DOI: 10.1016/j.jlumin.2024.120863
{"title":"Optical thermometry using efficient upconversion luminescence in Er3+ self-sensitized NaYS2 under multi-wavelength excitation","authors":"","doi":"10.1016/j.jlumin.2024.120863","DOIUrl":"10.1016/j.jlumin.2024.120863","url":null,"abstract":"<div><p>Herein, a series of Er<sup>3+</sup> self-sensitized NaYS<sub>2</sub> phosphors are synthesized by the solid-gas reaction method for a novel upconversion luminescence thermometer. Er<sup>3+</sup> possesses abundant excited state energy levels in the near-infrared region, enabling efficient upconversion luminescence by absorbing different near-infrared wavelength light. Compared to 980 nm excitation, the emission intensity is enhanced by nearly an order of magnitude under 1532 nm excitation, which can be attributed to the larger absorption cross-section of <sup>4</sup>I<sub>13/2</sub> and stronger absorption efficiency for Er<sup>3+</sup>. Based on the luminescence intensity ratio technique, the optical thermometry behaviors of NaYS<sub>2</sub>:Er<sup>3+</sup> under different wavelength excitation are evaluated by employing the thermally coupled energy levels of <sup>2</sup>H<sub>11/2</sub>/<sup>4</sup>S<sub>3/2</sub>. It can be deduced that the excitation wavelength has no significant effect on the temperature sensing parameters. Compared to other typical upconversion luminescence thermometers, NaYS<sub>2</sub>:Er<sup>3+</sup> thermometer exhibits not only excellent sensitivity performance but also high upconversion luminescence efficiency, which is expected to be applied in wide-temperature-range and highly-sensitive temperature sensing.</p></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142083954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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