Journal of Luminescence最新文献

{"title":"Growth and visible spectral properties of Pr3+ doped melilite gallium crystals","authors":"Yiyang Lin ,&nbsp;Ling Liang ,&nbsp;Yijian Sun ,&nbsp;Wei Wang ,&nbsp;Jianhui Huang ,&nbsp;Zhenggang Zou ,&nbsp;Guoliang Gong ,&nbsp;Herui Wen ,&nbsp;Chaoyang Tu","doi":"10.1016/j.jlumin.2025.121082","DOIUrl":"10.1016/j.jlumin.2025.121082","url":null,"abstract":"<div><div>In this article, 1 at% Pr³⁺ doped SrGdGa₃O₇ (Pr:SGGM) and CaLaGa₃O₇ (Pr:CLGM) crystals, belong to melilite gallium structure, have been successfully grown by the Czochralski (CZ) method. Crystal structure, spectral properties, and Judd-Ofelt (J-O) theory analysis have been studied in detail. Both Pr:SGGM and Pr:CLGM crystals exhibit a strong and wide absorption band at about 450 nm; the absorption cross sections for σ-polarization are 2.39 × 10⁻²⁰ cm² and 2.36 × 10⁻²⁰ cm² with the FWHM of 10.0 nm and 8.7 nm, respectively. The maximum emission cross-section, local at 645 nm for σ-polarization, is 2.62 × 10⁻²⁰ cm² with the FWHM of 4.1 nm for SGGM crystal and 6.62 × 10⁻²⁰ cm² with the FWHM of 4.2 nm for CLGM crystal. The fluorescence lifetime of the ³P₀ level was fitted to be 24.769 μs for Pr:SGGM and 26.089 μs for Pr:CLGM crystal, completely comparable to some excellent performance Pr³⁺ ion doped oxide crystals, such as Pr:ASL and Pr:SRA crystals. The large emission cross-section and long fluorescence lifetime indicate that Pr:SGGM and Pr:CLGM crystals are promising laser mediums for ultrafast and tunable lasers in the visible light range.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121082"},"PeriodicalIF":3.3,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138353","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}

{"title":"Role of shallow donor defects in inducing broad visible photoluminescence in ZnO thin film","authors":"Mohit Podia,&nbsp;Awnish Kumar Tripathi","doi":"10.1016/j.jlumin.2025.121083","DOIUrl":"10.1016/j.jlumin.2025.121083","url":null,"abstract":"<div><div>In the last three decades, ZnO and its different variants have received deeper attention among the scientific community due to growing research interest and the emergence of their diverse applications. Comprehensive investigations of ZnO thin films have been carried out by many focusing on their optical properties. The broad visible photoluminescence (PL) spectrum of ZnO has been attributed to the defects and imperfections in the thin films. In present work, undoped ZnO thin films are fabricated on quartz substrates via sol-gel spin coating approach followed by post-annealing at three different temperatures to vary the defect concentration. All films exhibit a hexagonal wurtzite phase and the dominance of pyramidal-tipped ZnO grains without the hexagonal cylinder, as confirmed by X-ray diffraction plots. The analysis of X-ray diffraction plots reveals that the interstitial site defects are dominant in our samples. To determine the elemental composition and chemical status of defects, X-ray photoelectron spectroscopy is performed. The characteristic ZnL₃M_4.5M_4.5 and O 1s spectra reveal the dominance of Zinc interstitial defects over the Oxygen vacancies in our thin films and their concentration to be sensitive to post-annealing temperature. The electron paramagnetic resonance measurements indicate the presence of zinc vacancies, the concentration of which is also monitored using the same strategy. The features of visible region PL spectra are analysed and are observed to be controlled by post-processing temperatures and hence by the defect concentration. The features of PL spectra are described using a schematic density of states diagram for the involved energetic electron relaxation mechanism and by invoking the key role of Zinc interstitial defects leading to a broad visible PL spectrum.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121083"},"PeriodicalIF":3.3,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138955","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}

{"title":"Investigating the optical and thermoluminescence properties of γ-irradiated Al2O3:Tb3+ phosphors for dosimetric applications","authors":"S. Satyanarayana Reddy ,&nbsp;K.R. Nagabhushana ,&nbsp;Sonia H. Tatumi ,&nbsp;N.R. Thejavathi","doi":"10.1016/j.jlumin.2025.121067","DOIUrl":"10.1016/j.jlumin.2025.121067","url":null,"abstract":"<div><div>This work demonstrates the solution combustion synthesis and characterization of Al₂O₃:Tb³⁺ phosphor, with a focus on its thermoluminescence (TL) properties for high dose γ – irradiated dosimetric applications. X-ray diffraction (XRD), confirms the formation of stable α-phase of Al₂O₃ with a rhombohedral structure The diffuse reflectance spectrum (DRS) shows the optical band gap of 4.21 eV and 4.25 for undoped and the Tb³⁺-doped samples respectively. The photoluminescence (PL) emission spectrum shows two set of characteristic emission from Tb³⁺ ions corresponding to the transitions ⁵D₃→⁷F_J (where J = 6–3) and ⁵D₄→⁷F_J (where J = 6–3). The 562 K peak in this study is unique because of its enhanced thermal stability and distinct emission behaviour, which are attributed to the doping with Tb³⁺. The optimized sensitivity was achieved at a dopant concentration of 0.05 mol% of Tb³⁺. This improvement in luminescent properties at elevated temperatures sets this study apart from existing research. Further, TL emission 3D spectra of γ – irradiated Al₂O₃:Tb³⁺ samples (0.05 and 1.00 mol%) shows characteristic transition emission of Tb³⁺, Cr³⁺ and Mn⁴⁺ and the relative intensities of the Tb³⁺ based two set of transitions emission ratios of the prominent TL glow peak were compared. TL kinetic parameters viz activation energy, order of kinetics and frequency factor were estimated by using the Computerized Glow Curve Deconvolution (CGCD) technique, with peak identification performed through the second derivative method. TL dosimetric properties such as dose response, reusability and minimum detectable dose were studied to assess their suitability for dosimetry applications. A TL mechanism based on the process of ionization of an electron, trapping and recombination is proposed.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121067"},"PeriodicalIF":3.3,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138948","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}

{"title":"Deciphering the near-infrared emission capabilities of chromium substituted BaLaLiTeO6 double perovskites","authors":"Sreelekshmi A K ,&nbsp;Subodh G ,&nbsp;Abhilash Kumar R G","doi":"10.1016/j.jlumin.2025.121079","DOIUrl":"10.1016/j.jlumin.2025.121079","url":null,"abstract":"<div><div>The enormous capability of near-infrared (NIR) spectroscopy heightens the demand for the development of broadband NIR phosphors. Chromium incorporated tellurate double perovskite compounds are seldom explored and could be a prospective choice for broadband NIR phosphors. The present work deals with the synthesis and the prospective NIR luminescence characteristics of a series of BaLaLiTe_1-xCr_xO₆ (x = 0, 0.004, 0.008, 0.01, 0.02, 0.04 and 0.06) double perovskite phosphors synthesized via solid-state reaction route for the first time. X-ray diffraction, Raman and FTIR spectroscopy analyses were employed to draw inferences about the structural modifications induced by the substitution of Cr³⁺ ions in BaLaLiTeO₆. The confirmation of valence states of all the ions by XPS analysis, optical characteristics by diffuse reflectance and photoluminescence spectroscopy were carried out in detail. The NIR luminescence of BaLaLiTeO₆ centered at 972 nm under 328 nm excitation is particularly striking and is attributed to the simultaneous existence of oxygen vacancies, Te⁴⁺ and Te⁶⁺ ions in the phosphor. The excitation spectra of BaLaLiTe_1-xCr_xO₆ monitored at 954 nm present excitation bands corresponding to host excitation, ⁴A₂(⁴F)→⁴T₁(⁴P), ⁴A₂(⁴F)→⁴T₁(⁴F) and ⁴A₂(⁴F)→⁴T₂(⁴F) transitions of Cr³⁺ ions. The photoluminescence emission spectra exhibited a broadband NIR emission with a FWHM of 168 nm by 270 nm excitation. BaLaLiTe_0.99Cr_0.01O₆ phosphor exhibited the highest emission intensity. The exact energy transfer mechanism and crystal field parameters of the synthesized phosphors were also explored in detail. This work attempts to probe into the possibility of tellurate-based double perovskite as NIR phosphor for NIR pc-LEDs and in diverse photonic fields.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121079"},"PeriodicalIF":3.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138951","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}

{"title":"Synthesis and characterization of two highly luminescent Eu3+ tris-β-diketonates with the δ-valerolactam ligand: Theoretical, experimental spectroscopy studies and viability as luminescent gunshot residues","authors":"Emmanuel M. Gomes ,&nbsp;Júlia P. de Oliveira Silva ,&nbsp;Guilherme L. dos Santos Oliveira ,&nbsp;Eduarda H.L.V. de Mello ,&nbsp;Adriano C. de Oliveira Novaes ,&nbsp;Marcos V. Colaço ,&nbsp;Danilo O. de Souza ,&nbsp;Jocelia S.M. Rodrigues ,&nbsp;Ricardo O. Freire ,&nbsp;Lippy F. Marques","doi":"10.1016/j.jlumin.2025.121069","DOIUrl":"10.1016/j.jlumin.2025.121069","url":null,"abstract":"<div><div>The luminescence exhibited by lanthanide ions has been increasingly applied in different areas of human knowledge. Among these metal ions, Eu³⁺ is certainly one of the most studied, due to the relative simplicity of its electronic structure and because it exhibits intense emission in the red region. An appropriate choice of ligands can result in lanthanide coordination compounds with high quantum efficiencies. The Eu³⁺ β-diketonates are intensively explored and of great interest in different applications. One of these applications is quite new, where Eu³⁺ β-diketonates are used as markers for firearm ammunition being found in the composition of gunshot residues (GSR). These GSR's are formed by lanthanide coordination compounds and can be detected in various weapon compartments, targets and spent cartridges, as well as on the clothing, hands, arms and face of the shooter by employing a simple black light lamp. In this context, Eu³⁺ β-diketonates exhibit high emission intensities and relative thermal stability, despite being completely outnumbered by lanthanide metal-organic frameworks (LnMOFs), widely employed as markers in GSR's. This study portrays an exhaustive work, from synthesis, structural characterization and photophysical studies to numerous forensic ballistics tests employing two new β-diketonates, <em>[Eu(tta)₃(δ-val) (H₂O)]</em> <strong>1</strong> and <em>[Eu(btfa)₃(δ-val) (H₂O)]</em> <strong>2</strong> (where δ-val = δ-valerolactam or 2-piperidinone), which can bring great advances for criminal experts and public security policy. These compounds were primarily tested as markers using a Taurus® G2C 9 mm pistol, a Glock® 23 Gen4 0.40 S&amp;W pistol and a Taurus® T4 5.56 mm rifle. The influence of projectile velocity on the marked ammunition and potential physical or chemical interactions of these markers with the gunpowder were assessed and a luminescent gunshot residues (LGSRs) impregnation test in cotton fabric (T-shirt) and in animal tissue was carried out. Furthermore, the LGSR of compound <em>[Eu(btfa)₃(δ-val) (H₂O)]</em> <strong>2</strong> were collected and analyzed through emission spectrum.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121069"},"PeriodicalIF":3.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138954","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}

{"title":"Insight into LIR-based speed sensing of Ho3+ upconversion luminescence","authors":"Ying Ji,&nbsp;Tao Pang,&nbsp;Peizhen Qiu,&nbsp;Junwen Mao","doi":"10.1016/j.jlumin.2025.121081","DOIUrl":"10.1016/j.jlumin.2025.121081","url":null,"abstract":"<div><div>Luminescence intensity ratio (LIR)-based speed sensing technology has attracted increasing attention since it can eliminate the influence of external factors such as instrument noise and environment. Unfortunately, it remains unclear how to improve speed sensitivity. Herein, we reported a novel candidate material, NaLu(MoO₄)₂:Yb³⁺/Ho³⁺, for LIR-based speed sensing. Mechanistic investigations show that the relative speed sensitivity is positively related to the intensity ratio of green and red emissions under steady-state excitation. As a result, it is crucial for high-sensitive speed sensing to set appropriate excitation conditions. When excited at a power density of 8.9 W/cm², a maximum relative sensitivity of ∼1.085 h/km is available. These findings provide keen insights into designing high-sensitive LIR-based speed sensors.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121081"},"PeriodicalIF":3.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138956","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}

{"title":"Effects of introducing indium in ternary alloy based optical field guiding layer around active region for deep UV laser emission","authors":"Kashish Sapra ,&nbsp;Indrani Mazumder ,&nbsp;Ashok Chauhan ,&nbsp;Kuldip Singh ,&nbsp;Manish Mathew","doi":"10.1016/j.jlumin.2025.121078","DOIUrl":"10.1016/j.jlumin.2025.121078","url":null,"abstract":"<div><div>In this simulation study, we investigate the impact of Indium Nitride content in the Aluminium Nitride-rich waveguide section of an ultraviolet laser diode that emits around 271 nm wavelength. In the laser diode, carrier confinement and optical confinement dictate output characteristics. These factors can be controlled through effective material engineering, and dopant activation as described in this paper. We plan to address the issue of confinement by introducing indium nitride in the molar fraction varying in small increments and observing the resulting modulation in device properties. The laser output power of the proposed structures increased approximately thrice when indium nitride content changed by 0.04 molar fraction percentage in Al_xIn_yGa_(1-x-y)N based waveguide. In the device with 0.04 indium nitride molar fraction-based waveguide on both sides, the power amplified from 22 mW to roughly 66 mW at a 1 A injection current. Besides, this arrangement helped in confining the optical field around the active region as well.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121078"},"PeriodicalIF":3.3,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138355","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}

{"title":"Effect of temperature on factors relevant to cryogenic laser operation in CaF2:Pr crystals","authors":"R. Lisiecki ,&nbsp;B. Macalik ,&nbsp;P. Solarz ,&nbsp;R. Kowalski ,&nbsp;J. Komar ,&nbsp;A. Strzęp ,&nbsp;Chonglei Xu ,&nbsp;Fengkai Ma ,&nbsp;Liangbi Su ,&nbsp;W. Ryba-Romanowski","doi":"10.1016/j.jlumin.2025.121068","DOIUrl":"10.1016/j.jlumin.2025.121068","url":null,"abstract":"<div><div>Visible emission spectra of CaF₂:0.35%Pr³⁺ crystals were recorded as a function of temperature from 5 K to 300 K with steps of 30 K. For each temperature point the linewidths ΔE and peak emission cross section σ_emax were evaluated for selected preponderant emission lines. For each emission lines the increase of temperature brings about the increase of emission linewidths and decrease of peak emission cross sections. As a consequence of thermal line narrowing the population densities needed to achieve generation threshold at 5 K are two times smaller roughly with respect to those at 300 K. Also, the peak stimulated emission cross sections at 10 K are greater than those at 300 K by factors of 2.78 and 2.57 for wavelengths 642 and 734 nm, respectively.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121068"},"PeriodicalIF":3.3,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138356","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}

{"title":"Zinc germanate based flexible scintillator film for high-performance X-ray imaging","authors":"Kang Xiao,&nbsp;Wenbin Wang,&nbsp;Xuan Liu,&nbsp;Xiangmei Liu","doi":"10.1016/j.jlumin.2025.121062","DOIUrl":"10.1016/j.jlumin.2025.121062","url":null,"abstract":"<div><div>Flexible scintillator films, characterized by their excellent conformal bonding ability, hold great potential for reducing image blurring and distortion in X-ray imaging, especially when dealing with non-planar or irregular objects. In this study, we employed Zn₂GeO₄ (ZGO) as the host matrix and doped it with Mn²⁺, Li⁺, and Cr³⁺ ions to regulate its luminescence performance. Rod-shaped ZGO-based scintillators (ZGO:0.5%Mn, ZGO:0.5%Mn,20%Li and ZGO:0.5%Mn,20%Li,0.4%Cr) with regular morphology, uniform size and excellent solution dispersibility were synthesized via hydrothermal method. The excellent solution dispersibility and high compatibility with the polymer matrices (i.e. polyvinyl alcohol, PVA) of the ZGO-based scintillators facilitate the fabrication of uniform and flexible scintillator films via microelectronic printing in blade coating mode. The resulting flexible scintillator film achieved an excellent spatial resolution of 14.6 lp mm⁻¹ and shows significant potential for low-dose X-ray imaging of both planar and non-planar objects.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121062"},"PeriodicalIF":3.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138254","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}

{"title":"Gold-silver bimetallic nanoparticles conjugated to asymmetric porphyrin for photodynamic therapy against triple negative breast cancer","authors":"N. Bridged Magaela ,&nbsp;Muthumuni Managa ,&nbsp;Tebello Nyokong","doi":"10.1016/j.jlumin.2025.121065","DOIUrl":"10.1016/j.jlumin.2025.121065","url":null,"abstract":"<div><div>5, 10, 15-Tris (4-nitrophenyl)-20-hydroxylphenylporphyrin (complex <strong>1</strong>) was synthesized and metalated with gallium chloride (complex <strong>2</strong>). These porphyrin complexes were then conjugated to biotin decorated gold-silver bimetallic nanoparticles (B-Au-Ag) to enhance photodynamic therapy efficiency. The photophysical properties of the porphyrin complexes and their conjugates were studied, and it was observed that the presence of (B-Au-Ag) enhanced the singlet oxygen quantum yield resulting in values of 0.60 and 0.74 for <strong>1</strong>-B-Au-Ag and <strong>2</strong>-B-Au-Ag, respectively. It was also observed that B-Au-Ag nanoparticles are more stable resulting in higher zeta potential when compared to the porphyrin conjugates. <strong>2</strong>-B-Au-Ag resulted with lowest cell viability of 24.67% when compared to all other photosensitizes.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"280 ","pages":"Article 121065"},"PeriodicalIF":3.3,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143138255","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}