ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Fengmei Zhu,Yuan Gao,Chunli Zhao,Jiacheng Pi,Jianbei Qiu
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) offer numerous advantages, including compact size, tunable emission spectra, energy efficiency, and high integration potential. These features make them highly promising for various applications, such as night vision monitoring, food safety inspection, biomedical imaging, and theragnostics. All-inorganic halide double-perovskite materials, known for their large absorption cross section, excellent defect tolerance, and long carrier diffusion radius, serve as unique matrices for constructing near-infrared fluorescent materials. In this study, we successfully prepared the all-inorganic metal halide double-perovskite Cs2NaYCl6:Cr3+ using a grinding–sintering method. A small fraction of the [YCl6] octahedra within the host material’s lattice was substituted with Cr3+ ions, resulting in the creation of the Cs2NaYCl6:Cr3+ phosphor. When excited with λ = 310 nm UV light, the phosphor exhibited a broad emission range spanning from 800 to 1400 nm, covering the NIR-I and NIR-II regions. It had a broad bandwidth emission of 185 nm and achieved a fluorescence quantum yield of 20.2%. The unique broadband emission of the phosphor originates from the weak crystal field environment provided by the Cs2NaYCl6 host matrix, which enhances the luminescence properties of the Cr3+ ions. To create NIR pc-LEDs, the phosphor was encapsulated onto a commercially available UV LED chip operating at 310 nm. The potential application of these NIR pc-LEDs in night vision imaging was successfully validated.
研究领域:
材料科学
·
光学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zaifa Yang,Wenyue Zhang,Zhide Wang,Yu Zheng,Yi Su,Haowen Xu,Zhengxin Guo,Ruoxuan Wang,Shuyu Yang
In recent years, near-infrared phosphor-converted light-emitting diodes (NIR pc⁃LEDs) have attracted a lot of attention in the fields of night vision, sensing and nondestructive testing. However, realizing multifunctional applications with the same material is still a great challenge. In this study, we prepared an efficient and thermally stable excellent Cr 3+ -activated Cd 3 Al 2 Ge 3 O 12 (CAG) garnet NIR phosphor. Under the excitation of 436 nm blue light, its NIR emission covers the range of 600–900 nm, the highest peak is at 714 nm and an internal quantum efficiency is 80.4 %. Meanwhile, the phosphor exhibits excellent thermal stability, and the integrated intensity of its NIR emission spectrum at 423 K temperature is 89.4 % of room temperature (89.4 %@423 K), which shows remarkable high thermal stability characteristics. The temperature-dependent properties of the fluorescence lifetime of Cr 3+ and the fluorescence intensity ratio of the thermally coupled energy levels in CAG:0.005Cr 3+ were utilized for thermometry studies from 100 K to 275 K. The relative thermometric sensitivities of the two methods reached a maximum value of 1.4 % K −1 at 200 K and a maximum value of 1.2 % K −1 at 100 K. Finally, the applications of the CAG:0.005Cr 3+ phosphor in plant illumination, night-vision monitoring and non-destructive testing of biological tissues were discussed by using the synthesized NIR pc⁃LEDs, which proves that the CAG:0.005Cr 3+ phosphor has a broad application prospect.
研究领域:
材料科学
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光学工程
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生物医学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanting Liu,Qiumei Li,Lili Meng,Qi Pang,Yanzhu Wang,Hua Yao,Qian Chen
Currently, lanthanide (Ln 3+ ) doped double perovskites (DPs) suffer from poor controllability of doping and the high concentration quenching phenomenon. Herein, a novel efficient energy transfer (ET) host of Cs 2 NaLuCl 6 Rare-earth-based (RE-based) DPs via Ag + /Bi 3+ co-doping for further Ho 3+ doping is developed. Benefiting from Ag + /Bi 3+ - manipulated the parity of the wavefunction of the self-trapped exciton, intense self-trapped excitons (STEs) broadband warm white visible emission is boosted. Specifically, photoluminescence quantum yield (PLQY) of co-doping with Bi 3+ and Ag + ions in Cs 2 NaLuCl 6 under 350 nm excitation is dramatically promoted to 86.19 % with half maximum (FWHM) of 224 nm. Although the pristine crystal Cs 2 NaLuCl 6 exhibits intrinsic blue emission with FWHM of 75 nm. Furthermore, the ET channel from STEs to Ho 3+ was constructed by tri-doping Ho 3+ , and the effective red and near-infrared (NIR) emission of Ho 3+ was obtained. Finally, NIR light-emitting diodes (LEDs) and white LED based on Ho 3+ doped/undoped Cs 2 Na 0.8 Ag 0.2 Lu 0.98 Bi 0.02 Cl 6 DPs were prepared with different application features. Specifically, white LEDs showed higher color rendering index and lower associated color temperature, while NIR LEDs showed good night vision imaging. This work provides a new strategy for the design of an ET host suitable for Ln 3+ doping, avoiding the effects of the concentration quenching phenomenon that always occurs in heavily doped hosts and realizing controllable doping.
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
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xinyu Fu,Huwei Li,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Near-infrared (NIR) light-emitting diodes (LEDs) are potential devices that could become the core components in biological imaging, security monitoring, etc., which are currently constrained by suboptimal luminous efficiency due to the absence of excellent luminescent materials. Here, we report a double perovskite Cs2NaInCl6 that is suitable for Cr3+ doping and exhibits broad NIR emission. Through direct absorption and energy transfer (ET) from the self-trapped excitons (STEs) induced in the Cs2NaInCl6 matrix, Cr3+ can be excited to 4T1(P), 4T1(F), and 4T2(F) levels. Then, the broad emission with a full width at half-maximum (FWHM) of ∼150 nm, spanning 800 to 1300 nm, and a high photoluminescence quantum yield (PLQY) of up to 70% can be realized, resulting from the 4T2→4A2 transition of Cr3+. Subsequently, the introduction of Yb3+ endows Cs2NaInCl6:Cr3+,Yb3+ with a higher PLQY of 76% at the optimal doping ratio than Cs2NaInCl6:Cr3+. Ultimately, a miniaturized NIR LED device packaged based on Cs2NaInCl6:15%Cr3+,15%Yb3+ has been fabricated, which demonstrates superior performance for night vision, traceless perspective detection, and biological imaging. This work not only screens out a suitable Cs2NaInCl6 matrix for Cr3+ doping with high PLQY but also promotes its luminescence performance through Yb3+ doping for NIR LED applications.
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
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jia-Lin Pan,Wan-Shan Shen,Hua-Hui Li,Lei Huang,Zong-Shuo Liu,Zhao-Kui Wang,Bao-Quan Sun,Ya-Kun Wang,Liang-Sheng Liao
Lanthanide-alloyed perovskite quantum dots (QDs, Yb 3+ : CsPb(Cl 1-x Br x ) 3 ) are promising in near-infrared light-emitting diodes (NIR-LEDs) for theoretically ≈200% photoluminance quantum yield because of quantum-cutting effect, where one high-energy photon is used as a source to generate two low-energy photons. However, the inferior stability of Yb 3+ : CsPb(Cl 1-x Br x ) 3 remains a big challenge. It is posited that vacancy-defect complexes during lanthanide ions alloying are the driving force behind the collapse of octahedral geometry. Here, a coordination agent compensation plus an in situ doping strategy is developed to address the incompatibility between high NIR emission and good stability. This is achieved by combining the sodium ion to fill the vacancy and a coordinating agent (pyridine-2-carboxylic acid) for passivation. This enabled the treated QD films to have a magnitude of order decreased deep trap density compared to the control. Besides, the treated composite exhibits a sixfold increase in NIR intensity and tenfold lower trap states. Using the optimized Yb 3 ⁺: CsPb(Cl 1-x Br x ) 3 , NIR-LEDs are fabricated and achieved an external quantum efficiency of 8.2%, one of the highest values among NIR LEDs with emission >950 nm. Furthermore, these LEDs exhibit a 30-fold increase in operational stability compared to the control.
研究领域:
材料科学
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光学
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纳米技术
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 23
·2201718
·
IF 10.05
Sheng Wu,Puxian Xiong,Quan Liu,Yao Xiao,Yongsheng Sun,Enhai Song,Yan Chen
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are promising for many applications in non-destructive testing, bio-imaging, and modern agriculture. However, developing self-activated NIR phosphors with high efficiency and excellent thermal stability is a great challenge for current research. In this work, a self-activated far-red to NIR emitting NaLaMgWO 6 phosphor is prepared by the high-temperature solid-state reaction method, whose luminescence properties are investigated in detail. In addition, the introduction of Bi 3+ ions as sensitizers enhances the emission intensity of far-red to NIR light (650-850 nm) through a Bi 3+ → WO 6 6– energy transfer design strategy, resulting in an increased internal quantum efficiency (IQE) from 56.4% to 64.8% and thermal stability from 54% to 72% (420 K). Finally, the combination of NaLaMgWO 6 :Bi 3+ with 365/460 nm commercial LED chip is prepared into NIR pc-LED devices, demonstrating satisfactory performance in the field of night vision detection and other wide range of practical applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Wei-Jia Wang,Wei-Zhi Liu,Shuai-Hao Xu,Dong-Ying Zhou,Zhi-Yun Peng,Zi-Qi Feng,Lai Feng,Liang-Sheng Liao
Efficient charge injection and defect passivation remain pivotal challenges in developing high-performance perovskite light–emitting diodes (PeLEDs). This study reports that [4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl] phosphonic acid (Me-4PACz) used as an interfacial modifier is capable of simultaneously reducing surface defects in FAPbI 3 perovskite films and enhancing hole injection from the polymeric hole-transporting layer (HTL). Additionally, tuning of the surface induces secondary grain growth in the perovskite film, resulting in larger grain sizes and a denser film morphology, which account for strongly suppressed leakage currents and nonradiative recombination in PeLEDs. Consequently, devices with this interface modification achieve a maximum external quantum efficiency (EQE max ) of 21.98% at a near-infrared (NIR) emission wavelength of 800 nm and an operational half-life (T 50 ) of 47.3 h under a constant current density of 50 mA cm −2 . This work underscores the significance of tailored interfacial engineering in optimizing both the performance and operational stability of PeLEDs for their practical applications.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 24
·8414-8424
·
IF 4
Tao Tan,Ran Pang,Shangwei Wang,Haiyan Wu,Jiutian Wang,Su Zhang,Chengyu Li,Hongjie Zhang
Cr3+-activated phosphors with high quantum efficiency show excellent promise in the field of near-infrared (NIR) phosphor converted light-emitting diodes (pc-LEDs). Here, we design an annealing program for Cr3+-doped phosphors containing variable valence elements that cannot be prepared in a reducing atmosphere to enhance their luminescence efficiency and thermal stability. A novel phosphor, Li2Mg3SnO6:Cr3+, developed by this annealing design, containing variable valence element Sn, exhibits higher quantum efficiency and better thermal stability than the one prepared by the conventional solid-state reaction. The Li2Mg3SnO6:0.03Cr3+ sample exhibits broadband NIR emission with a full width at half-maximum (FWHM) of 201 nm. After annealing, the internal quantum efficiency (IQE) and external quantum efficiency (EQE) of the Li2Mg3SnO6:0.03Cr3+ sample are enhanced from 48.5% to 84.7% and from 22.7% to 32.6%, respectively, and the thermal quenching temperature at which the luminescence intensity of the phosphor reduces to half of its initial value is promoted from ∼400 K to ∼425 K. The luminescence intensity of the optimized Li2Mg3SnO6:0.03Cr3+ sample at 425 K (∼152 °C) remains 49.2% of its initial intensity at 300 K. A NIR pc-LED is fabricated by combining the optimized Li2Mg3SnO6:0.03Cr3+ sample with a blue LED (455 nm blue chip), and the NIR radiant fluxes of 3.676 mW (at 10 mA) and 29.21 mW (at 100 mA), as well as a maximum NIR photoelectric efficiency of 14.2%, are obtained. The results show that this novel phosphor has great application potential in NIR pc-LEDs, and the annealing design exhibits huge potential for improving the optical properties of Cr3+-activated phosphors.
研究领域:
材料科学
·
光学工程
·
固体物理
·
光电子学
·
无机化学
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 19
·2207520
·
IF 13.3
Jianan Chen,Zhaobing Tang,Yangzhou Zhou,Shuo Ding,Liang Li,Lei Qian,Chaoyu Xiang
Formamidine lead iodide (FAPbI 3 ) is an important material for realizing high-performance near-infrared light-emitting diodes (NIR-LEDs). However, due to the uncontrollable growth of solution-processed films which usually causes low coverage, and poor surface morphology, the development of FAPbI 3 -based NIR-LEDs is hindered, restraining its potential industrial applications. In this work, by employing glutamine (Gln) in perovskite precursor, the quality of FAPbI 3 film is improved significantly. Due to the ameliorated solution process by the organic additive, the film coverage over the substrate is substantially enhanced. Meanwhile, the trap state of grain is largely reduced. Consequently, NIR perovskite LEDs are demonstrated with a maximum external quantum efficiency (EQE) of 15% with the emission peak at 795 nm, which is four times higher than the device with pristine perovskite film.
研究领域:
材料科学
·
光电学
·
化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Liu Yongjie,Tao Chen,Cao Yu,Chen Liangyan,Wang Shuxin,Li Pei,Wang Cheng,Liu Chenwei,Ye Feihong,Hu Shengyong,Xiao Meng,Gao Zheng,Gui Pengbing,Yao Fang,Dong Kailian,Li Jiashuai,Hu Xuzhi,Cong Hengjiang,Jia Shuangfeng,Wang Ti,Wang Jianbo,Li Gang,Huang Wei,Ke Weijun,Wang Jianpu,Fang Guojia
Formamidinium lead iodide (FAPbI 3 ) perovskites are promising emitters for near-infrared light-emitting diodes. However, their performance is still limited by defect-assisted nonradiative recombination and band offset-induced carrier aggregation at the interface. Herein, we introduce a couple of cadmium salts with acetate or halide anion into the FAPbI 3 perovskite precursors to synergistically passivate the material defects and optimize the device band structure. Particularly, the perovskite analogs, containing zero-dimensional formamidinium cadmium iodide, one-dimensional δ-FAPbI 3 , two-dimensional FA 2 FA n-1 Pb n I 3n+1 , and three-dimensional α-FAPbI 3 , can be obtained in one pot and play a pivotal and positive role in energy transfer in the formamidinium iodide-rich lead-based perovskite films. As a result, the near-infrared FAPbI 3 -based devices deliver a maximum external quantum efficiency of 24.1% together with substantially improved operational stability. Combining our findings on defect passivation and energy transfer, we also achieve near-infrared light communication with device twins of light emitting and unprecedented self-driven detection.
研究领域:
材料科学
·
光电
·
半导体物理
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mamuhe Yeerlan,Meng Zhang,Pengpeng Dai
Fe 3+ ions as near-infrared (NIR) activators are emerging as an alternative to Cr 3+ . 1–5 However, it is a challenge to develop Fe 3+ -activated NIR phosphors featuring tunable optical properties, high efficiency, and thermal stability. Herein, we present a series of near-unity internal quantum efficiency (IQE), wavelength-tunable and thermal stability NIR-emitting phosphors Sr 2− y Ca y Sc 1− x SbO 6 : x Fe 3+ (S 2− y C y S 1− x S: x Fe 3+ ). Sr 2 ScSbO 6 :1%Fe 3+ (SSS:1%Fe 3+ ) phosphor shows broadband NIR emission at 904 nm and near-unity IQE under excitation at 300 nm. Experimental and theoretical calculation results demonstrate that introduced Ca ions could increase the bandgap value and Debye temperature (Θ D ) of host from E g = 3.702 eV, Θ D = 609 K of y = 0 to E g = 3.801 eV, Θ D = 692 K of y = 2. Significantly, the resultant S 2− y C y S 1− x S:1%Fe 3+ NIR phosphors show wavelength-tunable emission from 904 to 952 nm and high IQE of 84.6%–97.5% as well as enhanced thermal stability ( I 423K / I 298K = 76.9%) of Ca 2 ScSbO 6 :1%Fe 3+ (CSS:1%Fe 3+ ) in comparison with that ( I 423K / I 298K = 70.6%) of pristine sample. We fabricated an NIR light-emitting diodes (LED) device by using CSS:1%Fe 3+ NIR phosphors with ultraviolet LED chip and demonstrated its potential applications in anticounterfeiting, information encryption, and night vision.
研究领域:
材料科学
·
光学
·
光子学
·
固体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）