Journal of Luminescence最新文献

{"title":"Room temperature red phosphorescence enabled by alkali treatment in niobium carbide-derived carbon dots","authors":"Bramhaiah Kommula ,&nbsp;Vinay Kumar Sriramadasu ,&nbsp;Santanu Bhattacharyya","doi":"10.1016/j.jlumin.2025.121591","DOIUrl":"10.1016/j.jlumin.2025.121591","url":null,"abstract":"<div><div>Room temperature phosphorescence (RTP) and afterglow emission in carbon dots (CDs) are typically achieved by embedding them into rigid external matrices to suppress vibrational relaxation. However, matrix dependence limits their practical utility. Herein, we demonstrated a simple solution-based acid-etching method to introduce a matrix-free approach for RTP and afterglow emission in CDs. Acid treatment cleaves metal-carbon bonds, forming well-defined CDs that, after alkali neutralization, exhibit strong blue fluorescence in solution. Upon solidification, the CDs emit yellowish-green fluorescence and red afterglow, lasting ∼1 s, without any additional matrix. CDs obtained directly from acidic or neutral conditions show no observable phosphorescence. Time-resolved area-normalized emission spectroscopy reveals that alkaline conditions promote surface rigidity and interchromophoric interactions, enhancing intersystem crossing and suppressing aggregation-induced quenching. This work demonstrates a robust, matrix-free approach for CD RTP with promising solid-state photonic and security applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121591"},"PeriodicalIF":3.6,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226969","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":"Dual-channel visible and NIR-III upconversion optical probe for bioimaging","authors":"Pengyang Xu ,&nbsp;Ziyi Zhao ,&nbsp;Yunze Liu ,&nbsp;Xiaoke Zhang ,&nbsp;Xixian Luo","doi":"10.1016/j.jlumin.2025.121586","DOIUrl":"10.1016/j.jlumin.2025.121586","url":null,"abstract":"<div><div>Fluorescence bioimaging, owing to its low invasiveness and real-time feedback capabilities, holds significant promise for biomedical applications. However, conventional fluorescent probes suffer from photobleaching and limited tissue penetration. In this study, we developed a dual-channel upconversion optical probe based on lanthanide-doped core-shell NaErF₄:Tm³⁺@NaYF₄:Yb³⁺ nanoparticles, capable of simultaneously emitting visible light at 654 nm and third near-infrared window (NIR-III) luminescence at 1523 nm under 980 nm excitation. The Tm³⁺ ions serve as energy traps, facilitating the Er³⁺→Tm³⁺→Er³⁺ energy transfer pathway, significantly enhancing both red and NIR-III emissions from the transitions of ⁴F_9/2 → ⁴I_15/2 and ⁴I_13/2 → ⁴I_15/2. Moreover, coating the core NaErF₄:Tm³⁺ nanoparticles with an active NaYF₄:Yb³⁺ shell led to a remarkable 210-fold enhancement in red emission intensity and the emergence of effective NIR-III emission This significant improvement in luminescence is attributed to the suppression of surface quenching by the core-shell structure and the enhanced absorption of 980 nm photons by Yb³⁺ ion in the shell. This dual-channel red and NIR-III luminescent nanoprobe could be a potential ideal probe for deep-tissue bioimaging. The ex vivo penetration experiment using porcine tissue demonstrated a deep tissue penetration of up to 10 mm in the NIR-III window. The Daphnia magna and Zebrafish treated with the nanoprobes display bright red emission without any background, indicating the excellent in vivo luminescent imaging capacity of NaErF₄:Tm³⁺@NaYF₄:Yb³⁺ nanoparticles. Our findings present a new class of dual-channel optical probes with visible and NIR-III emissions, enabling multiscale high-resolution biomedical imaging applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121586"},"PeriodicalIF":3.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226965","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":"A comprehensive review on synthesis methods, photodegradation mechanisms, and diverse applications of tin oxide (SnO2) nanoparticles","authors":"Ashish Kumar ,&nbsp;Deepika Maan ,&nbsp;Karishma Jain ,&nbsp;Sushil Kumar Jain ,&nbsp;Balram Tripathi","doi":"10.1016/j.jlumin.2025.121584","DOIUrl":"10.1016/j.jlumin.2025.121584","url":null,"abstract":"<div><div>The persistent release of synthetic dyes from textile, printing, and related industries poses severe environmental and health hazards due to their toxicity, stability and resistance to biodegradation. Among various semiconductor-based photocatalysts, tin oxide (SnO₂) has emerged as a promising candidate for dye degradation owing to high stability, strong oxidation potential and wide band gap. This review provides a comprehensive overview of recent advances in the photodegradation of dyes using SnO₂. Various synthesis methods including precipitation, hydrothermal, sol-gel, ultrasonication, ball milling and microwave methods are discussed with emphasis on how synthesis routes influence particle morphology, crystallinity and photocatalytic activity. The fundamental photocatalysis mechanism of SnO₂ is elucidated, highlighting charge generation, separation and reactive oxygen species (ROS) formation. Special attention is given to the development of SnO₂-based composites, such as coupling with metals, metal oxides, and carbonaceous materials, which enhance visible light response, reduce electron-hole recombination and improve degradation efficiency. Furthermore, the review addresses practical applications of SnO₂ photocatalysts in dye wastewater treatment, sensors, solar cells, antimicrobial activity and environmental remediation, while also outlining existing challenges and future prospects. By critically analysing the structure property performance relationships, this article aims to guide the design of next-generation SnO₂-based photocatalysts for sustainable environmental cleanup.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121584"},"PeriodicalIF":3.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226844","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":"Optical characteristics and Judd-Ofelt analysis of novel Ba3Sr(1-x)Nb2O9: xEu3+ phosphors for luminescent applications","authors":"Sincy Anna Oommen,&nbsp;Arya Gopinath,&nbsp;P.B. Gayathri,&nbsp;Cyriac Joseph,&nbsp;P.R. Biju","doi":"10.1016/j.jlumin.2025.121581","DOIUrl":"10.1016/j.jlumin.2025.121581","url":null,"abstract":"<div><div>Phosphor converted white light emitting diodes (pc-WLEDs) offer a highly promising solution for the development of efficient and sustainable solid state lighting technologies. In this work, UV/NUV/blue LED excitable red emitting triply perovskite type Ba₃Sr_(1-x)Nb₂O₉: xEu³⁺ (x = 0.02,0.04,0.06,0.08,0.10, and 0.12) phosphors were prepared using the conventional high temperature solid state reaction method. Structural and morphological studies were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDS), and fourier transform infrared spectroscopy (FTIR). XRD analysis confirmed the formation of a hexagonal structure with high purity, and the successful incorporation of Eu³⁺ ions was demonstrated. FESEM and TEM analysis revealed an agglomerated block like morphology. The calculated d-spacing values from HRTEM were consistent with the XRD results. EDS confirmed the elemental composition of the prepared sample. The optical properties were studied using diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy. From DRS and PLE spectra confirmed that the prepared phosphors could be efficiently excited at 280, 393, and 466 nm, corresponding to the dominant emission wavelengths of UV, NUV, and blue LED chips. Under these excitations, the characteristic peaks of Eu³⁺ ions corresponds to ⁵D₀ to ⁷F_J (J = 1,2,3 and 4) transitions were observed, in which most intense emission recorded at 609 nm. The optimum Eu³⁺ concentration was found to be x = 0.08 based on the concentration dependant PL spectra and the concentration quenching mechanism was ascribed to dipole-dipole interactions. PL emission decay curves show a double exponential nature, with shorter lifetimes in the millisecond range. The PL emission studies exhibited the generation of orange red light with CIE color coordinates (0.61,0.38), (0.62,0.37) and (0.63,0.36), achieving color purity of 100 % in warm light region. The internal quantum efficiency was determined to be 31.38 % under 393 nm exciation and 35.9 % under 466 nm exciation. JO theory was used to calculate the spectroscopic parameters (Ω₂ and Ω₄) with the trend following Ω₂ &gt; Ω₄ and the radiative parameters such as branching ratio, total transition probability, stimulated cross-section were evaluated. The better stimulated crossection and excellent orange red emission properties suggest the potential of Eu³⁺ doped Ba₃SrNb₂O₉ phosphors are a promising candidate for red emitting lasers and next generation solid state lighting applications.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121581"},"PeriodicalIF":3.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226842","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":"Photoluminescence efficiency of MBE-grown MoSe2 monolayers featuring narrow excitonic lines and diverse grain structures","authors":"Mateusz Raczyński ,&nbsp;Julia Kucharek ,&nbsp;Kacper Oreszczuk ,&nbsp;Aleksander Rodek ,&nbsp;Tomasz Kazimierczuk ,&nbsp;Rafał Bożek ,&nbsp;Takashi Taniguchi ,&nbsp;Kenji Watanabe ,&nbsp;Wojciech Pacuski ,&nbsp;Piotr Kossacki","doi":"10.1016/j.jlumin.2025.121576","DOIUrl":"10.1016/j.jlumin.2025.121576","url":null,"abstract":"<div><div>Recent studies have demonstrated that using hexagonal boron nitride (h-BN) as a substrate for the growth of transition metal dichalcogenides can significantly reduce excitonic linewidths. However, many other optical parameters still require optimization. In this work, we present a detailed study of the low-temperature photoluminescence efficiency of MBE-grown MoSe₂ monolayers on h-BN substrates, comparing them to state-of-the-art exfoliated monolayers encapsulated in h-BN. We demonstrate that a quantitative comparison between samples requires accounting for interference effects and Purcell enhancement or suppression of the emission. By accounting for these effects in both photoluminescence and Raman signals, we show that the overall intrinsic luminescence efficiency is proportional to the sample coverage. Consequently, we find that exciton diffusion and edge effects are not visibly affecting the spectroscopic properties of MBE-grown samples, even for nanometer-sized crystals.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121576"},"PeriodicalIF":3.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226968","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":"Visualization of graphene inhomogeneities using luminescence under terahertz and optical excitation","authors":"S.B. Bodrov ,&nbsp;A.A. Murzanev ,&nbsp;A.I. Korytin ,&nbsp;Yu.A. Sergeev ,&nbsp;A.V. Nezhdanov ,&nbsp;A.V. Vodopyanov ,&nbsp;D.V. Shestakov ,&nbsp;E.I. Preobrazhensky ,&nbsp;A.N. Stepanov","doi":"10.1016/j.jlumin.2025.121583","DOIUrl":"10.1016/j.jlumin.2025.121583","url":null,"abstract":"<div><div>Optical luminescence induced in graphene under intense terahertz pulses is investigated as a novel tool for visualization of graphene inhomogeneities (boundaries and macroscopic damages). The method is compared with the more established diagnostic approach based on graphene luminescence by optical excitation. Monolayer graphene samples on two different substrates – crystalline quartz and polyethylene terephthalate (PET) polymer – are examined using both methods, yielding images of the boundary and regions of the mechanically-damaged graphene. The terahertz-induced luminescence approach offers significant advantages: it produces higher-contrast images and remains effective on optically active substrates (e.g., PET), where optical-induced luminescence method fails. The obtained maps of the graphene samples are validated using optical and electron microscopy, as well as Raman spectroscopy.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121583"},"PeriodicalIF":3.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226967","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":"Energy transfer between luminescent silver clusters and Yb3+ ions in ion-exchanged layers of silica-based glass","authors":"L.Yu. Mironov ,&nbsp;D.V. Marasanov ,&nbsp;R.D. Kharisova ,&nbsp;K.S. Zyryanova ,&nbsp;S.V. Puzyryova ,&nbsp;I.E. Kolesnikov","doi":"10.1016/j.jlumin.2025.121585","DOIUrl":"10.1016/j.jlumin.2025.121585","url":null,"abstract":"<div><div>Silica-based glasses doped with Yb₂O₃ and combination of La₂O₃ and Yb₂O₃ were synthesized. Ag⁺ ions were introduced in the glass through Na⁺ -Ag⁺ ion exchange, further heat treatment of the glass samples initiates the formation of luminescent silver clusters. Glass samples show typical white luminescence of silver clusters as well as sensitized luminescence of Yb³⁺ ions under UV excitation. Introduction of Yb³⁺ ions into the glass decreases quantum yield and lifetime of silver cluster luminescence indicating the presence of energy transfer. While phosphorescence lifetime decreases gradually with increase in Yb³⁺ concentration, fluorescence lifetime shows only a minor decrease for the highest Yb₂O₃ content. Additionally, decrease in quantum yield is much higher than that of emission lifetime suggesting the coexistence of two different quenching mechanisms.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121585"},"PeriodicalIF":3.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226964","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":"Substituent group regulated delayed emissions for thermally activated delayed fluorescence and room temperature phosphorescence observed in an indole@metaboric acid system","authors":"Xiao-Fang Zhou,&nbsp;Xiao Rao,&nbsp;Bo Ding,&nbsp;Zheng-Guo Huang,&nbsp;Xiu-Guang Wang,&nbsp;Zheng-Yu Liu,&nbsp;En-Cui Yang","doi":"10.1016/j.jlumin.2025.121582","DOIUrl":"10.1016/j.jlumin.2025.121582","url":null,"abstract":"<div><div>Organic afterglow materials with tunable emission colors and persistent long-lived lifetimes have exhibited promising applications in organic light-emitting diodes, bioimaging, encryption and sensing. However, precise regulation on the emission pathway remains a great challenging because of the uncontrollable energy gap between the lowest singlet and triplet excited states (Δ<em>E</em>_ST) and slow intersystem coupling rate. Herein, three metaboric acid (HBO₂)-confined composites, <strong>ICA@HBO₂</strong>, <strong>Cl-ICA@HBO₂</strong> and <strong>COOH-ICA@HBO₂</strong>, were prepared by powerful matrix-assisted strategy with 1H-indole-4-carboxylic acid (ICA), 7-chloro-1H-indole-4-carboxylic acid (Cl-ICA) and 1H-indole-2,5-dicarboxylic acid (COOH-ICA) as chromophore and boric acid as matrix precursor. The orthorhombic metaboric acid matrix generated from dehydration of boric acid has uniformly anchored the indole chromophore by strong intermolecular hydrogen-bonding interactions, resulting in three white loose powdery composites. Under the excitation of low-energy visible light, both <strong>ICA@HBO₂</strong> and <strong>Cl-ICA@HBO₂</strong> emit cyan and pale-green thermally activated delayed fluorescence at ambient conditions with quite distinct lifetimes (1559 vs. 429 ms) and photoluminescence quantum yields (PLQYs, 13.71 % vs. 4.64 %), due to small Δ<em>E</em>_ST and favorable reverse intersystem crossing. By contrast, <strong>COOH-ICA@HBO₂</strong> modified by two carboxylic acid groups exhibits bright green room temperature phosphorescence with medium-length lifetime of 1066 s and the highest PLQY up to 22.42 %. Thus, substituted groups on the indole-parent with well-tunable conjugation and heavy atom effect, together with the rigid micro-environment and slight light-induced charge separation effect by metaboric acid matrix, have significantly manipulated the channel of the delayed emission through optimizing the Δ<em>E</em>_ST values. Furthermore, the opposite temperature-dependent emission intensity and naked-eye distinguishable lifetime have endowed these composites promising applications in thermal-responsive security display and multilevel information encryption.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121582"},"PeriodicalIF":3.6,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226847","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":"Efficient deep-red-emitting CaMg2La2W2O12:Mn4+, Nd3+ phosphor toward indoor plant cultivation LED lighting","authors":"Enjie He ,&nbsp;Xiangxiao Chen ,&nbsp;Yaqi Wu ,&nbsp;Yinkang Cui ,&nbsp;Tao Wang ,&nbsp;Fangfang Li ,&nbsp;Qingyan Han ,&nbsp;Xuzhong Zuo ,&nbsp;Nian Liu","doi":"10.1016/j.jlumin.2025.121578","DOIUrl":"10.1016/j.jlumin.2025.121578","url":null,"abstract":"<div><div>This study presents the synthesis and characterization of efficient deep-red-emitting CaMg₂La₂W₂O₁₂:Mn⁴⁺, Nd³⁺ (CMLW:Mn⁴⁺, Nd³⁺) phosphors for application in light-emitting diodes (LEDs) designed for indoor plant cultivation. The phosphors were prepared via a high-temperature solid-state reaction and exhibited an orthorhombic structure with optimal luminescence properties at Mn⁴⁺ (0.90 %) and Nd³⁺ (0.60 %) doping concentrations. The enhanced performance of CMLW:0.90 %Mn⁴⁺, 0.60 %Nd³⁺ over its Nd³⁺-free counterpart originates from three synergistic mechanisms: (1) Nd³⁺ substitution for larger La³⁺ induces lattice shrinkage, shortening the Mn⁴⁺-O^2- bond length and enhancing the crystal-field strength, thereby increasing the radiative transition probability of ²E_g→⁴A_2g emission at 708 nm; (2) Nd³⁺ co-doping suppresses concentration quenching by increasing the critical distance between Mn⁴⁺ ions, as evidenced by prolonged lifetime and higher optimal Mn⁴⁺ concentration; (3) The optimal Nd³⁺ concentration improves lattice rigidity while avoiding defect formation observed at higher doping levels. The resulting phosphor demonstrates intense deep-red emission matching the phytochrome P_FR absorption band, excellent thermal stability (73.66 % intensity at 453 K), and a high internal quantum efficiency (IQE) of 86.80 %. A prototype LED device exhibits stable deep-red emission and a luminous efficacy of 0.10 lm/W under 365 nm excitation. These results position CMLW:Mn⁴⁺, Nd³⁺ phosphor as a promising candidate for indoor plant cultivation LEDs.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121578"},"PeriodicalIF":3.6,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226846","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":"Temperature depended IV-curve method for determining LED internal quantum efficiency","authors":"M.A. Mintairov,&nbsp;V.V. Evstropov,&nbsp;D.A. Malevsky,&nbsp;P.V. Pokrovskii,&nbsp;N. Yu Davidyk,&nbsp;N.A. Kalyuzhnyy","doi":"10.1016/j.jlumin.2025.121573","DOIUrl":"10.1016/j.jlumin.2025.121573","url":null,"abstract":"<div><div>A new method for determining the internal quantum efficiency (IQE) of band-to-band luminescence of a light-emitting diodes (LED) is proposed and considered. The IQE value is represented by the product of <em>g</em> and <em>θ</em> values, where g is the band-to-band recombination fraction of the total current and <em>θ</em> is the internal quantum yield of band-to-band recombination, i.e. the fraction of the radiative part of this channel. As shown in the paper, <em>g</em> value can be determined from the experimental IV-curve. The <em>θ</em> value is determined based on the model of the band-to-band channel as a recombination defect. With decreasing temperature, the nonradiative part of the band-to-band channel critically decreases, while the radiative part does not depend on temperature. At ultimately low temperatures, the internal quantum yield of the channel tends to unity. This property allows determining <em>θ</em> values for any temperature using the analysis of the experimental temperature dependence of the electroluminescence intensity. Determining <em>g</em> and <em>θ</em> values allows finding IQE for any temperature (including room temperature). The method has been approved for LEDs fabricated on the basis of MOVPE grown AlGaAs heterostructures with InGaAs multiple quantum wells emitting at wavelength of on 850, 910 and 940 nm. All LEDs have shown maximal IQE of about 80 %–90 %.</div></div>","PeriodicalId":16159,"journal":{"name":"Journal of Luminescence","volume":"288 ","pages":"Article 121573"},"PeriodicalIF":3.6,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145226970","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}