CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhaoqi Liu,Yuan Tang,Xiaohong Zhang,Nian Pan,Haiyan Shi,Pengbo Lyu,Changfu Xu,Lizhong Sun
Double-perovskites materials are suitable matrices for hosting Cr 3+ ions to achieve highly efficient near-infrared (NIR) luminescence. In this study, the Sr 2 AlNbO 6 : x Cr 3+ (SANO:0.15 % Cr 3+ ) phosphors were synthesized by doping Cr 3+ ions into the double perovskite Sr 2 AlNbO 6 (SANO) using a high-temperature solid-state method. The substitutional preferences of Cr 3+ ions in the lattice were systematically investigated, considering variations in ionic radius, crystal field strength, and energy transfer dynamics. The optimal SANO:0.15 % Cr 3+ phosphor exhibited narrowband NIR emission centered at 760 nm (700–900 nm) under 323 nm excitation, with distinct phonon sidebands. The strong crystal field environment was evidenced by a Dq / B value of 2.66. The phosphor demonstrated outstanding performance, including an internal quantum efficiency of 66.1 %, absorption efficiency of 43.0 %, and external quantum efficiency of 28.4 %. Additionally, it exhibited excellent thermal stability, retaining 52 % of its room-temperature emission intensity at 423 K. When incorporated into an NIR pc-LED device with a 310 nm chip, the phosphor enabled clear imaging of objects in dark environments using an NIR camera. These results underscore the potential of SANO:0.15 % Cr 3+ phosphors for night-vision illumination and next-generation NIR technologies.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyu Zhang,Wanyuan Li,Chao Wang,Lin Zhang,Shuxing Li,Rong-Jun Xie
β-Sialon:Eu 2+ (Si 6-z Al z O z N 8-z :Eu 2+ , 0 < z ≤ 4.2) has been recognized as an excellent narrow-band green phosphor for wide-color-gamut backlights, but it is quite difficult to realize high quantum efficiency when further reducing the bandwidth of β-Sialon:Eu 2+ to achieve high color purity. Herein, we propose an ingenious sintering method to minimize the trade-off between color purity and luminescence intensity of β-Sialon:Eu 2+ , and finally obtain ultra-narrow band β-Sialon:Eu 2+ with an emission maximum of 527 nm, a full width at half maximum of 44.9 nm and an external quantum efficiency of 37.3 % when z is reduced to 0.03. Structural analyses indicate that β-Sialon:Eu 2+ shows higher structural ordering and rigidity with decreasing the Al-O substitution ( i.e. , z value). By combining β-Sialon:Eu 2+ (z = 0.03), a red phosphor K 2 SiF 6 :Mn 4+ with a blue InGaN LED chip, white light-emitting diodes with a luminous efficacy of 93.91 lm W −1 and a color gamut as high as 101.2 % National Television System Committee standard were demonstrated, which are superior to those in color gamut (4.3–16.8 % up) by using commercial β-Sialon:Eu 2+ .
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zheng Lu,Dashuai Sun,Sida Shen,Zeyu Lyu,Luhui Zhou,Pengcheng Luo,Shuai Wei,Hongpeng You
The pursuit of high-quality phosphors exhibiting swift response to near-ultraviolet (n-UV) excitation, elevated quantum efficiency (QE), superior thermal stability, and impeccable light quality has been a focal point of investigation. In this research, we synthesized a novel K2La2B2O7:Ce3+,Tb3+ (KLBO:Ce3+,Tb3+) color-tunable phosphor that meets these requirements. KLBO:Ce3+ can be stimulated efficiently by the n-UV light and shows an intense blue emission centered at 437 nm. Notably, KLBO:0.04Ce3+ exhibits exceptional internal QE (IQE = 94%) and outstanding thermal stability (I423 K/I303 K = 88%). Optimization of doping compositions enables efficient Ce3+ → Tb3+ energy transfer, resulting in substantial enhancements in QE and thermal stability. Specifically, KLBO:0.04Ce3+,0.28Tb3+ achieves an IQE of 98% and a thermal stability of 97%, higher than those of most phosphors of the same type. White light-emitting diodes fabricated using phosphor samples emit warm white light characterized by high Ra (Ra = 96.6 and 93.4) and low CCT (CCT = 4886 and 4400 K). This study underscores the feasibility of enhancing phosphor QE and thermal stability through energy transfer mechanisms.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Ye Chen,Zunxian Yang,Jiaxiang Wang,Hui Zhang,Yue Chen,Xudong Jiang,Yuting Bai,Jiajie Hong,Benfang Liu,Zheyu Zhou,Runsen Yu,Zhezhou Fang,Jinzhu Gao,Xuanyao Song,Zhiyu Yuan,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Quantum dot (QD) based light-emitting diode devices (QLEDs) attracted significant academic interest due to their outstanding color saturation and convenient solution-based manufacturing processes. Currently, the external quantum efficiency (EQE) of red, green, and blue QLEDs reached their own theoretical limits. However, there was still a common phenomenon of roll-off existed in QLEDs. In this work, QLEDs with an ultra low roll-off were realized via simple carrier injection regulation strategy in achieving carrier recombination balance and exhibited excellent repeatability. By modifying quantum dots and electron transport layer (ETL), the champion device with the peak EQE of 15.2 %, and a current efficiency (CE) of 63.4 cd/A was successfully fabricated, which were 1.9 and 2.0 times greater than those of the control devices, respectively. The devices delivered a peak brightness of 266,778 cd/m 2 , and the EQE remained at 15.0 % at a brightness of 50,000 cd/m 2 , staying above 14 % within the range of 3000 to 200,000 cd/m 2 . At a voltage of 10 V, the peak EQE of the optimized devices decreased by only 7.6 % when compared with their optimum value of EQEs, while the EQE of the control device declined by 26.6 %. Finally, analysis of 40 different batches of devices revealed an average EQE of 14.3 %, demonstrating that this strategy exhibited good repeatability. This approach provided a convenient means to regulate carrier injection and further elucidated the relationship between roll-off and carrier injection balance in QLEDs, proposing a strategy to enhance their performance and simultaneously mitigate roll-off.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jian Liu,Haijing Zhou,Xuchao Wang,Wenwu Zhao,Shaozhuo Liu,Xinyu Li,Yihao Wang
A series of novel borate fluoride phosphors, Ba 4 CaB 4 O 10 F 2 : x Eu 3+ ( x = 0, 0.01, 0.04, 0.06, 0.09, 0.12, 0.14, 0.17, 0.20, 0.22, 0.25,0.28, and 0.3), were successfully synthesized using the high-temperature solid-state method. The X-ray diffraction (XRD) patterns, photoluminescence properties, thermal quenching mechanisms, quantum efficiencies, and lifetime decay curves of these phosphors were thoroughly investigated. Upon excitation at 394 nm, the synthesized phosphors exhibited strong red-light emission at 613 nm, attributed to the electric dipole 5 D 0 → 7 F 2 transition of Eu 3+ . The optimal doping concentration of phosphors was found to be 25 mol%. The quantum efficiency of the Ba 4 CaB 4 O 10 F 2 :0.25Eu 3+ phosphor was measured to be 49.9 %. Simultaneously, the thermal stability measurement revealed that the light intensity of Ba 4 CaB 4 O 10 F 2 :0.25Eu 3+ attained 44.5 % of its initial value at 477 K. The Commission International de L'Eclairage (CIE) chromaticity coordinates of Ba 4 CaB 4 O 10 F 2 :0.25Eu 3+ were determined to be (0.6465, 0.3531) and its color purity was determined to be 96.2 %. These findings highlight the potential of the Ba 4 CaB 4 O 10 F 2 :0.25Eu 3+ fluorescent material for near-UV-excited pc-WLEDs applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhiqiang Bao,Shilei Yu,Xiaoyang Guo,Yunpeng Wang,Ying Lv,Deyue Zou,Li Song,Xingyuan Liu
Blue perovskite light-emitting diodes (PeLEDs) are increasingly crucial for manufacturing high-definition full-color displays due to their outstanding electroluminescent properties. Quasi-two-dimensional (quasi-2D) perovskite stands out as the most promising material for blue light-emitting layer, given its robust quantum/dielectric confinement. In this study, we present the preparation of PeLEDs with a tunable blue emission wavelength using pure bromide perovskite components by adjusting the content of halogenated organic ammonium bromide [2-bromoethylamine hydrobromide (BEABr)]. The bifunctional ligand BEABr not only achieves an excellent phase distribution of quasi-2D perovskite but also reduces the weak van der Waals gap between individual perovskite layers, facilitating effective energy transfer in perovskite films. Additionally, the bifunctional groups passivate perovskite defects and inhibit phase separation, leading to efficient and stable sky-blue luminescence. The BEABr-doped sky-blue PeLED demonstrated superior device performance, achieving a maximum external quantum efficiency of 16.98 % at 493 nm. This work serves as inspiration for further exploration of efficient and stable commercial blue PeLED devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 22
·2400722
·
IF 8
Zhen-Yu Ma,Bai-Sheng Zhu,Xue-Chen Ru,Yi-Chen Yin,Li-Zhe Feng,Guan-Jie Ding,Mei-Yu Zhou,Yong-Hui Song,Hong-Min Zhou,Cheng-Ming Wang,Jing-Ming Hao,Hong-Bin Yao
Inorganic CsPbI 3 perovskite has great potential to fabricate deep-red light-emitting diodes (LEDs) owing to excellent color purity, thermal stability, and carrier mobility. However, fabricating high-quality CsPbI 3 thin films for high-performance LEDs remains challenging. While it is demonstrated that hydrogen bonds between organic ammonium cations and molecule additives can lead to high-quality organic–inorganic hybrid perovskite films, this method cannot be applied to CsPbI 3 thin films due to the absence of hydrogen bonds between Cs + ions and additives. In this study, an amorphous complex-seed-crystal growth process to fabricate high-quality γ -CsPbI 3 cuboid crystallite thin films, is reported. During the initial annealing, the metastable intermediates formed crystal nucleate seeds and transformed into amorphous complex intermediates, maintaining stability at an elevated temperature for perovskite crystallization. With prolonged annealing, the amorphous complex around the nucleate seeds gradually converts to γ -CsPbI 3 perovskite, enabling us to fabricate CsPbI 3 thin films with high crystallinity and orientation. The resulting deep-red LEDs exhibit a peak external quantum efficiency (EQE) of 16.5% and a high maximum luminance of 3158 cd m −2 . Moreover, the devices show significantly suppressed efficiency roll-off, maintaining an EQE of 14.8% even under a high current density of 500 mA cm −2 .
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 8
·2501-2509
·
IF 4.4
Liu Wen-bo,Du Xue-rong,Wang Cheng-cheng,Zhuo Chun-xue,Chang Jin,Wang Na-na,Li Ren-zhi
Cesium copper halides have attracted increasing attention for light-emitting diodes (LEDs) applications due to their high photoluminescence quantum efficiency (PLQE) and non-toxicity. However, the current film fabrication methods for copper halides cannot simultaneously meet the high-performance, eco-friendly, and good environmental tolerance requirements. Here, we demonstrate a facile approach that combines the advantages of both traditional nanocrystal-based methods and precursor solution-based methods. Through treating Cs 3 Cu 2 I 5 nanocrystal films with proper alcohols, Cs 3 Cu 2 I 5 /CsCu 2 I 3 mixed-dimensional copper halides are formed with enhanced PLQE and improved energy level matching. This enhances the peak EQE of copper halide LEDs to 0.8%, which is among the highest efficiency of lead-free metal halide nanocrystal LEDs. This work provides a new strategy for fabricating high-performance lead-free LEDs in an eco-friendly manner.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 54
·32976-32983
·
IF 3.119
Xinyu Zhao,Lixiang Huang,Yukun Wang,Xinglin Zhu,Lei Li,Guoxin Li,Wenhong Sun
Efficient CH3NH3PbI3 photodetectors (PDs) with an extremely high gain of the maximum external quantum efficiency (EQE) of 140 000% within the ultraviolet region to the near infrared region (NIR) and an extremely high responsivity (R) under a low bias of −5 V were successfully fabricated. The fabricated devices manifested outstanding environmental stability with only 10% degradation of EQE after being exposed to air for 24 h. These obtained results indicate the promising potential of perovskite PDs for visible light communication applications.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Yaqian Zhang,Jianming Liu,Yujie Zhang,Haisheng Yang,Yanxia Yu,Qingyun He,Xiaojuan Liang,Yongfu Liu,Weidong Xiang
At present, solid-state laser-driven lighting fabricated with blue laser diode (LD) and phosphor has been greatly developed in high-power lighting applications. The major obstacle is the luminescence saturation threshold of the fluorescence conversion material (YAG:Ce). In this work, we successfully prepared a series of high-quality and robust YAG:Ce single crystals . With high quantum efficiency (QE = 92%), regular crystal structure and high thermal conductivity , the single-crystal has excellent ability to deal with high radiation flux and thermal accumulation generated by high power. Matching the single-crystal with the laser, the luminous efficiency up to 274 lm/W and saturation threshold of 12 W/mm 2 were obtained. In addition, the influence of Ce doping concentration and sample processing conditions on the indicators in laser-driven white lighting was systematically studied. The results are of great significance and are believed to promote the development of solid-state laser-driven lighting.
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
Nano Energy
·
2018
·
IF 13.12
Xinzheng Yue,Shasha Yi,Runwei Wang,Zongtao Zhang,Shilun Qiu
In artificial photocatalysis for hydrogen (H 2 ) generation from water reduction, low apparent quantum efficiency (AQE) always confines the photocatalytic conversion efficiency. Here, we demonstrate a new strategy for the design and synthesis of one-dimensional (1D) SrTiO 3 @Mo 2 C core-shell nanostructure for highly enhanced photocatalytic H 2 generation activity. The thin nanolayer of Mo 2 C improves the interfacial conductivity, facilitates transport of photo-generated charge carriers as well as prolongs charge carriers’ lifetime, that minimizing the recombination of photo-generated electrons and holes. Thus SrTiO 3 @Mo 2 C hybrid achieves drastically enhanced photocatalytic H 2 generation rate up to 7.93 mmol h −1 g −1 with respect to the pristine SrTiO 3 (0.53 mmol h −1 g −1 ) in a solar-driven reaction system, with an AQE of 29.3% at 313 nm. The charge carrier dynamics based mechanism was further confirmed by analysis of time-resolved photoluminescence (TRPL), surface photovoltage (SPV), transient photovoltage (TPV), open circuit potential (OCP) decay curves as well as the electrochemical impedance spectroscopy (EIS) measurements. It is unambiguously to demonstrate that Mo 2 C is a highly active cocatalyst to dramatically boost the charge separation for photocatalytic water reduction.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 11
·5634-5638
·
IF 6.739
Weikuan Duan,Yanyan Zhang,Zhongyue Wang,Jingyi Jiang,Chen Liang,Wei Wei
K5NdLi2F10 nanocrystals were synthesized by a novel synthetic route in the liquid phase, which could improve the morphology and reduce the size effectively, for the first time. The luminescence intensities of the K5NdLi2F10 nanocrystals and their dispersion in polyethylene glycol 400 (PEG-400) approximate to that of neodymium doped phosphate glass (3 mol%), while the lifetimes of the nanocrystals alone and when dispersed with Nd3+ ions (1 × 1020 cm−3) are 303.4 μs and 174.6 μs respectively. Based on the Judd–Ofelt analysis, the emission quantum yield of the dispersion reaches 39.57%. In all, the K5NdLi2F10 nanocrystals and their dispersion have promising applications as liquid laser materials and biological fluorescent markers.
研究领域:
材料科学
·
光学
·
生物标记物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）