INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Gaoke Dong,Bing Hu,Chen Chen,Hailong Yu,Qiuju Han,Wenzhi Wu
Organic–inorganic metal halides have attracted great attention due to their tunable structural and spectroscopic properties. Here, two organic–inorganic hybrid manganese bromides, (TEMA)2MnBr4 (TEMA = triethylmethylammonium) and (TEBA)2MnBr4 (TEBA = benzyltriethylammonium), are synthesized using the evaporation crystallization method. Following a heat-induced phase transition at 363 K, the structure and optical properties of (TEMA)2MnBr4 change but return to their initial state upon cooling to room temperature, as confirmed by X-ray diffraction, photoluminescence (PL), and Raman spectra. Meanwhile, (TEBA)2MnBr4, with a larger Mn–Mn distance, exhibits a higher photoluminescence quantum yield of 98.1% and greater thermal quenching temperature. However, due to the poorer thermal stability of the organic cation, the crystal melts at 400 K, leading to fluorescence quenching. White LEDs based on (TEMA)2MnBr4 and (TEBA)2MnBr4 are successfully fabricated with color rendering indices of 97.4 and 97.2, respectively. The investigation provides deep insights into the structural and optical properties of (TEMA)2MnBr4 and (TEBA)2MnBr4, advancing research for LED display design by tuning organic cations.
研究领域:
材料科学
·
光电技术
·
固体化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Yang Zhou,Shuai Zhang,Xiaoming Wang,Huan Jiao
A novel red oxyfluoride phosphor K3TaO2F4:Mn4+ has been prepared by a simple two-step synthesis method. The structure, composition, and luminescence properties of K3TaO2F4:Mn4+ phosphors were investigated and discussed in detail. The real structure of K3TaO2F4 was carefully studied through X-ray powder diffraction data Rietveld refinement. K3TaO2F4 holds a D4h group symmetry [TaO2F4]3– octahedron with the oxygen occupying the para-position. Under ultraviolet (UV) and blue light excitation, K3TaO2F4:Mn4+ phosphor emits a narrow band red emission peaking at 630 nm. High-performance warm white-light-emitting diodes (WLEDs) were fabricated using a blue LED chip, YAG:Ce3+ yellow phosphor, and K3TaO2F4:Mn4+ red phosphor. This device exhibits high color quality (CCT = 3488 K, Ra = 93.0, R9 = 90.0), which indicates that Mn4+-doped K3TaO2F4 would be a promising red phosphor for WLED applications.
研究领域:
材料科学
·
光电子学
·
固态化学
·
光子学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 10
Lyuchao Zhuang,Qi Wei,Ren Hui,Duanzijing Liu,Wei Gao,Yiming He
The [PbX 6 ] 4− octahedron, while serving as the fundamental building block in perovskites and endowing exceptional photoelectric properties, exhibits inherent molecular softness and structural distortion that led to dynamic instabilities. Notably, the collapse of lead-halide octahedra triggered by halide vacancies presents a critical challenge to stability and performance, particularly in mixed-halide perovskite systems. Herein, we demonstrate a molecular engineering strategy using alkali metal trifluoromethanesulfonate additives, which are proposed to stabilize the perovskite lattice via a multi-anchoring mechanism. The sulfonyl oxygen groups are believed to interact with under-coordinated Pb sites, while the alkali metal cations are suggested to associate with halide species at the crystal surface, collectively mitigating octahedral distortion. This cooperative stabilization is supported by enhanced phase purity, suppressed nonradiative recombination, and improved optical performance in quasi-2D perovskite films. Consequently, the optimized perovskite films exhibit superior blue emission characteristics with a high photoluminescence quantum yield (PLQY) of 65.32%. The resultant blue PeLEDs deliver an external quantum efficiency (EQE) of 15.60% at 487 nm with a device lifetime of 220 min, representing a competitive performance compared with state-of-the-art blue PeLEDs in this spectral range. This work establishes octahedral stabilization as a fundamental design principle for advancing high-performance perovskite optoelectronic devices.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yijie Wen,Shuai Hu,Chao Lin,Xin Guo,Jinshu Huang,Maohui Yuan,Kai Han
As an emerging ultrawide bandgap semiconductor, Ga2O3 nanoparticles (NPs) have garnered significant attention across various fields due to their high thermal and chemical stability. Conventional synthesis methods for Ga2O3 NPs, such as high-temperature solid-state reactions and hydrothermal processes, encounter challenges including complex procedures, limited scalability, and production of large particle sizes. In this study, we develop a straightforward approach to synthesize phase-pure, nanosized Ga2O3 NPs through flame spray pyrolysis, followed by an annealing treatment. By the incorporation of trivalent chromium ions (Cr3+) into the Ga2O3 NPs, it achieves intensive near-infrared (NIR) luminescence, specifically the R lines associated with the 4T2 → 4A2 and 2E → 4A2 transitions. These R lines are sensitive to cryogenic temperatures due to their relatively small energy difference. The synthesized Ga2O3 NPs demonstrate excellent ratiometric thermometric performance within the temperature range of 83–213 K, achieving a maximum relative sensitivity of 3.35% K–1 at 83 K based on the Boltzmann distribution of the luminescent thermometer. Furthermore, an efficient NIR phosphor-converted LED (pc-LED) device is fabricated by employing Cr3+-doped Ga2O3 NPs, which are excited by using a blue LED chip. This NIR pc-LED is subsequently applied in night vision illumination and anticounterfeiting detection.
研究领域:
材料科学
·
纳米技术
·
光学传感器
·
半导体物理
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Miao Zhang,Minqiang Wang,Zhi Yang,Junjie Li,Hengwei Qiu
In recent years, all-inorganic lead halide perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals as kinds of new luminescent materials have attracted more and more attentions because of their size tunable emission wavelength, narrow emission peak, high luminous efficiency and good air stability. Herein we have synthesized all-inorganic halide perovskite nanocrystals by hot-injection method and anion exchange reaction, achieving the whole visible light region from 410 to 700 nm with narrow spectral in the range of 15–40 nm. Moreover, a white light emitting diode (WLED) was constructed by stacking CsPbBr 3 QDs-ethyl acetate composite film and CaSrAlN 3 :Eu 2+ -poly (methyl methacrylate) composite film on the blue LED chip, displaying the ideal white light with the chromaticity coordination at (0.3379, 0.3432) and the color temperature of 5261 K. Because of the deep traps resulted from partial oxidation at the QDs' surface under large excitation light intensity, the WLED is not stable enough to work at a high operation current, but it can work steadily under a relatively lower operation current.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Di-Wei Zhang,Wei Zhou,Zhi-Guo Xia,Ze Zhang,Xiu-Ting Li
Red-emitting CdTe@SrSO 4 composites phosphors have been successfully fabricated via a two-step precipitation and following electrostatic assembly process. By adjusting the molar ratio of [Sr 2+ ]/[SO 4 2− ], the morphologies of SrSO 4 products vary from rods to rhombs with the increasing thickness, and comparative luminescence properties and phase formation mechanism of as-prepared CdTe@SrSO 4 composites have been investigated. The CdTe@SrSO 4 composites with a rod-like shape show optimum luminescence properties, as well as relatively good thermal stability. White LED prototype based on the CdTe@SrSO 4 composites has been fabricated, and a CIE coordinate of (0.400, 0.389), the correlated color temperature (CCT) of 3600 K, and color rendering index (CRI) of 94.3 can be achieved. The results indicate that CdTe@SrSO 4 composites may have potential in phosphor-converted white LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 27
·275201
·
IF 3.5
Muhammad Amin Padhiar,Yongqiang Ji,Minqiang Wang,Shusheng Pan,Sayed Ali khan,Noor Zamin Khan,Lei Zhao,Fangrong Qin,Zhuan Zhao,Shaolin Zhang
Perovskite nanocrystals (NCs) feature adjustable bandgap, wide absorption range, and great color purity for robust perovskite optoelectronic applications. Nevertheless, the absence of lasting stability under continues energization, is still a major hurdle to the widespread use of NCs in commercial applications. In particular, the reactivity of red-emitting perovskites to environmental surroundings is more sensitive than that of their green counterparts. Here, we present a simple synthesis of ultrathin ZrO2 coated, Sr2+ doped CsPbBrI2 NCs. Introducing divalent Sr2+ may significantly eliminate Pb° surface traps, whereas ZrO2 encapsulation greatly improves environmental stability. The photoluminescence quantum yield of the Sr2+-doped CsPbBrI2/ZrO2 NCs was increased from 50.2% to 87.2% as a direct consequence of the efficient elimination of Pb° surface defects. Moreover, the thickness of the ZrO2 thin coating gives remarkable heat resistance and improved water stability. Combining CsPbSr0.3BrI2/ZrO2 NCs in a white light emitting diode (LED) with an excellent optical efficiency (100.08 lm W−1), high and a broad gamut 141% (NTSC) standard. This work offers a potential method to suppress Pb° traps by doping with Sr 2+and improves the performance of perovskite NCs by ultrathin coating structured ZrO2, consequently enabling their applicability in commercial optical displays.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuang Zhao,Lulu Lou,Shuwen Yuan,Daoyun Zhu,Fugen Wu,Zhongfei Mu
The near-infrared phosphor converted light-emitting diodes (NIR pc-LEDs) have been broadly used in the fields of night vision, biomedicine, nondestructive testing and food analysis. Over the past few years, many Cr 3+ doped NIR phosphorus has been reported. However, the realization of ultra-broad band NIR emission with high quantum efficiency remains a great challenge. Here, we report an ultra-broadband NIR emitting phosphor Li 3 Sc 1.92 (PO 4 ) 3 :0.08Cr 3+ with a full width at half maximum (FWHM) of 240 nm. The reason for the ultra-broad emission band is that the host Li 3 Sc 2 (PO 4 ) 3 provides two different kinds of ScO6 octahedral sites for Cr 3+ ions to occupy. This FWHM is better than most NIR emitting phosphors reported so far. Our research indicates that Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ phosphors have great potential in night vision and NIR spectroscopy .
研究领域:
材料科学
·
光电技术
·
光子学
·
光谱学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 29
·14108-14115
·
IF 5.8
Jiaying Zheng,Jiwei Ma,Minghuai Yu,Hao Xie,Dongdong Yan,Yihong Dong,Yi Liu,Xiaoyu Wang,Weixiang Ye
Inorganic CsPbI3 perovskite nanocrystals (NCs) exhibit remarkable optoelectronic properties for illumination. However, their poor stability has hindered the development of light-emitting diodes (LEDs) based on these materials. In this study, we propose a facile method to synthesize Mg2+-doped CsPbI3 NCs with enhanced stability and high photoluminescence (PL) intensity under ambient air conditions. Theoretical calculations confirm that doped NCs possess stronger formation energy compared to undoped NCs. The undoped CsPbI3 NCs emit red light at approximately 653 nm. We optimize the doping ratio to 1/30, which significantly enhances the photoluminescence of single-particle CsPbI3 NCs. Subsequently, we fabricate a red LED by combining the CsPbI3 NCs with a blue chip. The resulting LED, based on the doped CsPbI3 NCs, exhibits excellent performance with a high luminance of 4902.22 cd m−2 and stable color coordinates of (0.7, 0.27). This work not only presents a simple process for synthesizing perovskite NCs but also provides a design strategy for developing novel red LEDs for various applications.
研究领域:
材料科学
·
光电技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Bing Wang,Yonglin Wang,Ming Cui,Ting Yu,Zurong Du,Wanfu Wang,Pengbo Lyu
Lead-free copper halides have emerged as promising candidates for solid-state lighting, yet many reported systems still face challenges of limited efficiency, severe self-absorption, or insufficient device stability. Here, we report the synthesis of transparent millimeter-sized single crystals of (C8H20N)2Cu2Br4 (TEA2Cu2Br4) via a facile antisolvent-assisted evaporation method. Structural analysis confirmed that bulky TEA+ cations encapsulate [Cu2Br4]2− units, forming a spatially confined low-dimensional framework that promotes efficient radiative recombination of self-trapped excitons (STEs). TEA2Cu2Br4 exhibits deep-blue emission at 478 nm with a large Stokes shift of 166 nm, a long photoluminescence lifetime of 54 µs, and an ultrahigh PLQY of 98%. The material demonstrates remarkable robustness against continuous illumination, thermal cycling, electrical bias, and ambient exposure, with decomposition occurring only above 300 °C. Furthermore, ultraviolet-excited WLEDs fabricated by integrating TEA2Cu2Br4 with CsCu2I3 deliver balanced white emission with CIE coordinates of (0.3175, 0.3593), a correlated color temperature of 6138 K, and retain 93.8% of their initial electroluminescence intensity after 20 days of continuous operation. These results highlight TEA2Cu2Br4 as a structurally well-defined, high-performance hybrid copper halide with strong potential for environmentally friendly solid-state lighting.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hangzhang Kou,Fanlei Qin,Jianfeng Wang,Esmaeil Heydari,Gongxun Bai
Near-infrared (NIR) wireless communication has been widely investigated because of its fast transmission speed and good penetration barrier performance. Despite their promising characteristics, the implementation of these materials is substantially limited by thermal degradation effects. To address this challenge, we developed Cr3+-activated gadolinium gallate phosphors that exhibit an emission bandwidth of 92.8 nm at half-maximum intensity while maintaining 86.3% of the initial luminous intensity at 150 °C. Furthermore, phosphor-converted light-emitting diodes (pc-LEDs) were manufactured, attaining a 1060 mW NIR output power and 360 mA current. The device was used to test the signal transmission effect using the prepared NIR pc-LEDs as the light source. In the case of input sine wave, inverse sine wave, and triangle wave, the transmission of the waveform was realized, and its penetration performance was tested. The experimental findings demonstrate that the proposed material exhibits promising applications in NIR optical communication systems.
研究领域:
材料科学
·
光学通信
·
固态照明
·
光子学
·
半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Communications Materials
·
2026
·
IF 9.1
Li Qinghua,Gao Tianfu,Rao Xinhao,Ren Zhelei,Duan Haodi,Xie Xiaomin,Liao Jiaxin,Xue Shuwen,Xu Bin,Jin Xiao,Zhao Weifeng,Bai Jinke
Translating advanced luminescent materials into field-deployable screening tools remains a core challenge, demanding synergy between advanced optical materials and device engineering. Here, we demonstrate a portable dual-mode near-infrared semi-quantitative screening device. the luminescence performance of the core emitting materials, specifically lead-free Nd³⁺/Yb³⁺ co-doped Cs₂NaYCl₆ double perovskite phosphors, was first optimized through a machine-learning (ML) guided approach. Subsequently, these optimized phosphors were integrated to enable the device. Specifically, the Nd³⁺-doped emitter targets the 885 nm characteristic absorption band of alcohol while exhibiting anomalous thermal quenching, whereas the Nd³⁺/Yb³⁺ variant leverages 78.66% energy transfer efficiency to yield stable 985 nm emission (70% retention at 500 K) matching the characteristic absorption band of water. These optimized phosphor-converted LEDs were integrated into a compact detector featuring a coaxial dual-disc stepper mechanism and a customized three-stage circuit that amplifies faint optical signals into a five-level visual indicator. This configuration enables rapid screening of alcohol (30–60%) and water content (45–100%). Validated on commercial samples, this work establishes a holistic platform bridging high-precision instrumentation and real-world portability.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）