ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Bufan Yu,Xingxing Duan,Zhaohui Xing,Jiacheng Liu,Yutong Pan,Lei Wang,Jiangshan Chen,Dongge Ma
Quasi-2D perovskites are emerging as promising materials for light-emitting applications due to their pronounced quantum confinement effects. Blue perovskite light-emitting diodes (PeLEDs) remain fundamentally challenging yet critically demanded for display applications. Current strategies employing quasi-2D perovskites face inherent trade-offs: 1) increased spacer cation content enhances quantum confinement for blueshift but deteriorates charge transport through insulating organic layers; 2) multiphase quantum well formation broadens emission spectra (fwhm >25 nm), compromising color purity; 3) chloride incorporation for bandgap widening induces deep-level traps and accelerates halide segregation under operational voltage. Herein, we address these intertwined challenges through multifunctional additive engineering using phenylbiguanide (PBG). The conjugated molecular structure with dual −NH2/═NH groups enables 3-fold functionality: First, strong Pb–PBG coordination effectively passivates uncoordinated halide vacancies, suppressing nonradiative recombination and achieving a high photoluminescence quantum yield (PLQY) of 76.6%. Second, hydrogen-bonding networks between PBG and [PbX6]4– frameworks immobilize halide ions, inhibiting electric-field-driven Cl/Br phase segregation. Third, PBG modulates crystallization kinetics to produce a narrow quantum well distribution for narrow emission (fwhm = 21 nm) at 472 nm and efficient Förster resonance energy transfer. The synergistic effects yield pure-blue PeLEDs with an impressive EQE of 9.32% at 472 nm, with stable emission and a 10-fold enhancement of lifetime compared to the pristine device without PBG. This work offers a promising approach to the development of high-performance blue PeLEDs using quasi-2D perovskites.
研究领域:
材料科学
·
光电子学
·
半导体器件
·
发光二极管
·
钙钛矿材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kangliang Peng,Huiqing Xu,Xueqing Yang,Lin Chen,Lifang Chen
The exploitation of phosphors with tunable color emissions is of great significance in the field of display and lighting. Herein, a series of Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors have been successfully synthesized via a high-temperature solid-state reaction method. The luminescence properties of the synthesized NaMgPO 4 phosphors were systematically investigated. The incorporation of Dy 3+ enables the tuning of emission peaks in NaMgPO 4 :Eu 3+ phosphors through an efficient energy transfer (ET) process from Eu 3+ to Dy 3+ , thereby facilitating white light emission in a single-composition phosphor. Eu 3+ and Eu 2+ co-activated NaMgPO 4 phosphors were achieved by controlling the reduction of Eu 3+ to Eu 2+ under a reducing atmosphere generated by activated carbon. Photoluminescence (PL) spectra revealed simultaneous blue emission from Eu 2+ and red emission from Eu 3+ . By varying the amount of activated carbon, tunable emission colors can be realized in the Eu 3+ /Eu 2+ codoped NaMgPO 4 phosphors. Consequently, through the strategic design of rare-earth ion codoping, the Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors exhibit promising practical applications in phosphor-converted white light-emitting diodes (LEDs).
研究领域:
材料科学
·
发光材料
·
光电子学
·
固态化学
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jintong Lu,Shuangping Yi,Yixuan Zhou,Pengfei Xu,Zhengfa Hu,Weiren Zhao,Yinhai Wang
Metal halide perovskite nanocrystals have excellent prospects in solid-state lighting, flexible display, sensing, and other optoelectronic applications due to their superb photoelectric properties (high quantum efficiency and fast carrier diffusion speed). However, they are susceptible to environmental factors such as ultraviolet radiation and polar solvents. Especially in a water environment, poor stability seriously restricts the application of perovskite optical devices . In this paper, a kind of porous polymer (ethylene-vinyl acetate copolymer , EVA) and perovskite nanocrystals were mixed to form perovskite nanocrystals-EVA composites. The obtained composites were aged in water for 21 days, and the fluorescence enhancement was 170 times. Even in a strongly acidic environment, the fluorescence enhancement was 91 times. The information encryption mode of the composite material can effectively encrypt information in a wet environment due to the change of light wavelength, making a white light-emitting diode (w-LED). This metal halide perovskite nanocrystals-EVA composite will unleash a wide variety of solid-state lighting and flexible display possibilities that are limited by the use of existing methods in humid and strongly acidic environments.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 21
·9659-9667
·
IF 7.79
Jingkun Xu,Shiming Guo,Junfeng Qu,Shuhong Xu,Chunlei Wang,Dayan Ban,Yiping Cui
All-inorganic cesium lead halide perovskite nanocrystals (NCs) are quite promising materials for emission-based applications. However, the intrinsic toxicity of lead, as well as the weak stability, remains to be resolved. Exploring more and more types of lead-free NCs with high photoluminescence quantum yields (PLQYs) and high stability is a fundamental task. This work gave the first example of copper doped cesium halide (Cu:CsX, X = Br, Cl/Br, Br/I) NCs with good stability and high PLQYs (∼31.2%), which could act as a new member of the lead-free NC family. A simple single-step ultrasonic method was applied for the synthesis of environmentally friendly Cu:CsX NCs. By varying the halide composition, the emission wavelength of Cu:CsX can be shifted within 450–505 nm. The as-prepared NCs show highly uniform size and excellent stability. Finally, UV pumped light-emitting diodes are demonstrated by using Cu:CsX NCs as a color conversion layer.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 37
·15070-15081
·
IF 5.7
He Lin,Shuangqiang Fang,Tianchun Lang,Jiali Yu,Haoliang Cheng,Jiaqi Ou,Zhijie Ye,Renjie Xu,Xiulan Shui,Haolin Qu,Le Wang
Near-infrared (NIR) luminescent materials exhibit unique photophysical properties that make them crucial components in photobiological, photonic and optoelectronic applications. Nonetheless, almost all rare earth ions are difficult to be efficiently excited by blue light for NIR emission, mainly due to the inherent electron shielding effect of 5s25p6 orbitals. Here, an amazing enhancement of the Tm3+ 3H4 → 3H6 transition (800 nm) was achieved in the SrGa12O19 host upon 450 nm excitation. Compared with the Tm3+ single-doped sample, the internal quantum efficiency (IQE) in the 700–900 nm range was significantly improved from less than 1% to 74%, and the external quantum efficiency (EQE) was enhanced from nearly 0 to 33%, benefitting from the synergistic effect of Cr3+ contribution and electron shielding effect breaker of In3+. XRD structure refinement, time-resolved fluorescence spectroscopy and electron paramagnetic resonance were used to determine the effect of Cr3+ and In3+ doping. Furthermore, the universality of this strategy has also been verified with other rare earth ions (Ho3+, Nd3+, and Yb3+). Finally, a NIR phosphor-converted LED (pc-LED) is fabricated, exhibiting a satisfactory output power of 141 mW@500 mA and demonstrating the potential for photosynthetic bacteria culture, venous imaging and non-destructive testing. This work opens a window for blue light-pumped NIR emission of rare earth ions.
研究领域:
材料科学
·
光学
·
生物光子学
·
光生物学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Wenji Zhan,Haifei Wang,Jiahao Guo,Yugang Liang,Yanming Wang,Jixin Wu,Zhengzheng Dang,Ni Zhang,Jingjing Cao,Yingping Fan,Yu Zou,Bowei Li,Yao Wang,Yuetian Chen,Yanfeng Miao,Yixin Zhao
Deep-red light-emitting diodes (LEDs) with 690−710 nm emission show high significance in optical, agricultural, and biomedical applications. As primary candidates for deep-red emitters, all-inorganic CsPbI 3 films suffer from fused large grains with abundant trap states, leading to inferior performance of deep-red perovskite LEDs (PeLEDs). Here we report CsPbI 3 nanocrystal films with strong space confinement and notable performance at ∼700 nm of deep-red emission via bulk fabrication. The dual roles of diaza-18-crown-6 dihydriodide additive as crystallization regulator and Lewis base ligand trigger more nucleation sites, retarded grain growth and passivated trap states, ensuring the crystallization of high-quality space-confined CsPbI 3 nanocrystal films. This approach establishes a record-high external quantum efficiency (EQE) of 23.4% for deep-red PeLEDs, and achieves a maximum luminance of 10152 cd m −2 . Low roll-off is also demonstrated that EQE maintain over 20% under a high current density of 900 mA cm −2 , which is superior to state-of-the-art deep-red organic and quantum-dot LEDs. The T 50 operating lifetime is estimated to be 234 h at an initial radiance of 6.3 W sr −1 m −2 . This work provides an effectual strategy to accelerate radiative recombination and enhance the performance of CsPbI 3 -based deep-red PeLEDs.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
钙钛矿发光二极管
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Chunhao Wang,Shuai Zhang,Qiongyu Bai,Yuan Wang
From the practical point of view, the luminescent thermal behavior of phosphors is an important factor. In this work, two factors are found to influence the thermal quenching behavior of Eu 3+ in a series of Eu 3+ doped K 5 Bi(Mo x W 1- x O 4 ) 4 solid solution phosphors. These factors are the energy of the charge transfer state (CTS) and the thermal ionization process. With the introduction of Mo in the host matrix, the energy of CTS decreases, and the thermal ionization process is enhanced, which leads to a deterioration of thermal stability in solid solution phosphors. The thermal stability is improved by increasing the doping content of Eu 3+ , which may correlate to the weakening of the thermal ionization process. The K 5 Bi 0.7 (Mo 0.5 W 0.5 O 4 ) 4 :0.3Eu phosphor possesses favorable color stability and color purity at high temperatures. Meanwhile, such phosphor matches well with a 365 nm LED chip and exhibits intense and pure red emission at a drive current of 200 mA.
研究领域:
材料科学
·
光电技术
·
磷光技术
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yu Chen,Yiwen Zhong,Zenghui Diao,Diyun Chen,Lingjun Kong
This study addresses the challenge of eliminating persistent antibiotics like levofloxacin (LEV) from wastewater by developing a ZnO/ZnFe 2 O 4 heterojunction catalyst through a sol-gel method. The heterojunction synergistically combines ZnO and ZnFe 2 O 4 to reduce bandgap energy (1.89–1.99 eV) and enhance visible-light absorption. Under energy-efficient LED irradiation (5 W, 320–780 nm), the ZnO/ZnFe 2 O 4 -PMS system achieved 94.11% LEV degradation within 90 min, alongside 58.61% total organic carbon removal efficiency and 71.69% defluorination efficiency, outperforming individual components and physical mixtures. Mechanistic investigations revealed that reactive oxygen species ( 1 O 2 , SO 4 - ∙, ‧O 2 - and ‧OH) and holes jointly oxidize LEV. The heterojunction’s built-in electric field effectively suppressed charge recombination, as being confirmed by photoluminescence and photocurrent analyses. Remarkably, the catalyst retained >87% efficiency over four cycles with negligible metal leaching efficiency (<1%), demonstrating robust stability. This work highlights the dual advantages of the ZnO/ZnFe 2 O 4 heterojunction and LED-driven activation, offering a scalable and energy-efficient strategy for antibiotic wastewater remediation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2023
·Vol. 78
·期 11
·1061-1067
·
IF 1.8
Arif Ullah,Jinghao Zhuang,Zheng Liu,Xiaozhan Yang,Wenlin Feng
In this work, the phosphors of Eu 3+ ions doped Ba 2.9 Sr 0.1 WO 6 were successfully synthesized by the high-temperature solid-state method. The luminescence properties, including the emission and excitation spectra, fluorescent lifetimes, and CIE chromaticity coordinates were characterized. The crystal structure and composite of the samples were investigated by XRD (X-ray diffraction), and HRTEM (high-resolution transmission electron microscope). The emission spectra consist of the characteristic peak of Eu 3+ excitation at 393 nm; the leading emission peak at 618 nm can be ascribed to the transition of 7 F 0 → 5 L 6 . The optimal red emission is achieved by 2 % Eu 3+ doping. This red Ba 2.9 Sr 0.1 WO 6 : Eu 3+ has good luminescent properties and may have potential application in white LEDs.
研究领域:
材料科学
·
光电材料
·
荧光粉材料
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jin Yang,Jianhao Zha,Qinan Mao,Heyi Yang,Lang Pei,Jiasong Zhong
Indoor plant cultivation has been receiving increased attention due to concerns about sustainable agricultural production. Phosphor-converted light-emitting diodes (pc-LEDs) offer substantial promise as lighting solutions for regulating plant growth. However, the quest for high-performance phosphors with precise responsiveness to far-red phytochromes poses a challenge. Our study proposes a chemical substitution strategy to develop near-infrared (NIR) phosphors, YAl3–xGax(BO3)4:Cr3+. Benefiting from Ga3+ replacement of Al3+, a red shift in the NIR emission of YAl3–xGax(BO3)4:Cr3+ is realized to attain a good alignment with far-red phytochrome absorption centering at 730 nm. The optimized YAl2.5Ga0.5(BO3)4:Cr3+ exhibits a favorable quantum yield of 71.8% and robust thermal stability of 101.0%@423 K, owing to local structural distortion and thermal repopulation caused by Ga3+ incorporation. The fabricated pc-LED combined with the phosphor yields an NIR output power of 40.9 mW and a photoelectric conversion efficiency of 15.4% at 100 mA. Plant growth experiments demonstrate that under NIR illumination from the devices, the average lengths of pea roots and stems gain 127 and 225% promotion, respectively, further highlighting the potential of YAl2.5Ga0.5(BO3)4:Cr3+ phosphors for applications in plant cultivation.
研究领域:
材料科学
·
光电子学
·
园艺照明
·
固态照明
·
光生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xikun Zou,Xiaojun Wang,Haoran Zhang,Yunyan Kang,Xian Yang,Xuejie Zhang,Maxim S. Molokeev,Bingfu Lei
Far-red/phytochrome (P FR ) plays a key role in photomorphogenesis of plants. However, how to obtain a near-infrared (NIR) emitting phosphor with high external quantum efficiency (EQE), suitable spectral profile, and low thermal quenching remains a huge challenge. Herein, a NIR phosphor, Gd 2.4 Lu 0.6 Ga 4 AlO 12 :Cr 3+ ,H 3 BO 3 (GLGA:Cr 3+ ) was developed via regulating the crystal field environment and adding fluxes, which exhibits a peak maximum at 728 nm with a relatively narrow full-width at half maximum (FWHM) of 107 nm, matching well with the absorption band of P FR . Upon 450 nm excitation, the internal quantum efficiency (IQE) and EQE of the optimal phosphor are 90.3% and 32.0%, respectively. At 423 K, the integrated emission intensity of the investigated phosphor is about 75% of that at room temperature. Benefiting from the excellent optical performance, a NIR phosphor-converted light-emitting diode (pc-LED) was fabricated, which shows a NIR output power of 505.99 mW and photoelectric conversion efficiency of 11.24% at 300 mA. Moreover, plant growth experiments demonstrate that the biomass of pea seedlings is increased by 67.72% under supplementary NIR light irradiation. The findings of this research will motivate further research on new Cr 3+ -doped NIR phosphors for regulating photomorphogenesis of plants.
研究领域:
材料科学
·
光学
·
植物生物学
·
农业科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yu-Yin Wang,Ya-Jie Hu,Rui-Yu Sun,Yunyun Li,Xiao-Wei Zhang,Wen-Wen Zhang,Wen-Jing Deng,Xiu-Rui Hu,Wei Shanshan,Guoming Lin
Developing lead-free hybrid metal halides with stable and efficient white-light emission remains a critical challenge for next-generation optoelectronics. Here, we report a polar zinc-based organic–inorganic hybrid halide, [EMPA]2Zn3Br12 (EMPA = 5-[(4-ethylpiperazin-1-yl)methyl]pyridin-2-amine), which exhibits broadband white-light emission with a high color rendering index of 90 and high photoluminescence quantum yield of 43.9%. The material shows nonlinear optical properties with a measurable second-harmonic generation response. Unlike conventional hybrid halides, [EMPA]2Zn3Br12 demonstrates exceptional stability, retaining its structure and luminescent properties after 60 days of immersion in water and prolonged exposure to UV irradiation. Temperature-dependent photoluminescence measurements reveal that the material maintains its white-light emission from room temperature down to 260 K. Density functional theory calculations suggest that the broadband emission originates from multiple self-trapped exciton states, facilitated by Jahn–Teller distortions in the [ZnBr4]2– tetrahedra. Furthermore, a white-light-emitting diode fabricated using [EMPA]2Zn3Br12 as a single component white light emitter, demonstrating its potential for solid-state lighting. This study highlights [EMPA]2Zn3Br12 as a promising lead-free alternative for environmentally friendly high-performance white-light-emitting and optoelectronic applications.
研究领域:
材料科学
·
光电子学
·
无机化学
·
固体物理
·
应用物理
·
纳米技术
✓ 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）