OPTICAL ENGINEERING
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2025
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IF 1.2
Xianzhen Huang,Yun Ye,Jiaqi Gao,Xingke Zheng
Color conversion layers are extensively utilized in flat panel display technology for their capacity to provide a wide color gamut and improved resolution, along with exceptional design flexibility. The uniformity and thickness of cadmium selenide (CdSe) quantum dot (QD) films are often difficult to control in the preparation of color conversion layers. Interestingly, it is possible to precisely deposit QDs by inkjet printing to improve material utilization. Color conversion layers with optimized spectral properties and light conversion efficiency are successfully prepared by inkjet printing. We employ inkjet printing technology to fabricate CdSe QD color conversion layers with precise control over layer thickness. The effects of layer thickness on spectral properties and light conversion efficiency are systematically investigated. It is found that a layer thickness of 5.5 μm achieves the highest light conversion efficiency at 20.4%, with efficiency decreasing as thickness increases to 6 μm. In addition, it is observed that blue light transmittance decreases from 47.2% to 11.4% with increasing layer thickness, highlighting the importance of thickness control in optimizing spectral properties.
研究领域:
材料科学
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高影响因子
Journal of Semiconductors
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2025
·Vol. 46
·期 5
·052803
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IF 5.3
Ziyu Cai,Junchi Zhu,Chenyuan Ding,Tao Dong,Boyang Yu,Wenzheng Hu,Jiayi Xie,Feng Ye,Qiufeng Ye,Zebo Fang
Owing to their low toxicity and remarkable stability, perovskites based on antimony and bismuth have garnered significant interest in recent years. However, A3B2X9 perovskite materials derived from antimony and bismuth face several challenges, including excessively wide band gaps, elevated defect densities, and suboptimal film quality, all of which hinder advancements in device efficiency. While extensive studies have been undertaken to investigate the effects of modulating the A-site and X-site elements in lead-free A3B2X9 perovskites, there remains a notable scarcity of reports addressing the impact of modifications to the B-site element. In this study, we investigated the alloying of antimony and bismuth within the 2D Cs3B2I6Br3 perovskite. By systematically varying the ratios of two elements, we found that the incorporation of both antimony and bismuth at the B-site significantly enhances the quality of the perovskite films. Our findings indicate that a 1 : 1 ratio of antimony to bismuth produces the densest films, the highest photoluminescence intensity, and superior photovoltaic performance. Ultimately, the devices fabricated using this optimal ratio achieved an open-circuit voltage (VOC) of 1.01 V and a power conversion efficiency (PCE) of 0.645%.
研究领域:
材料科学
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能源工程
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高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 32
·期 10
·922-927
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IF 3.081
Wei Chen,Kai Wang,Junjie Hao,Dan Wu,Shang Wang,Jing Qin,Chen Li,Wanqiang Cao
Graphical A high luminous efficiency of quantum dots (QDs) can be attained when incorporating them into mesoporous silica particles by a non-chemical method. The obtained luminescent microbeads can be dispersed into a polymer by physical blending. Composite films demonstrate a high light-conversion efficiency, as well as an excellent stability under high-temperature and high-humidity conditions.
研究领域:
材料科学
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光学工程
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高影响因子
Small
·
2024
·Vol. 20
·期 50
·2405908
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IF 13
Lei Wang,Letu SiQin,Yiming Wang,Shuyu Li,Wenjing Xin,Jingyuan Guo,Ruijian Liu,Hongmei Luan,Chengjun Zhu
The Sol-gel precursor solution reaction mechanism has a significant impact on the Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells. It is discovered that in the Cu 2 ZnSnS 4 (CZTS) precursor solution (CZTS-PS) in the preparation, there is an association reaction among Cu 2+ , thiourea (Tu), and carboxyl (-COOH), which is an important reason for the undesirable CZTSSe solar cells. The strong association reaction generates excessive Cu 2+ ions, forming the Cu x Se secondary phase on the surface of the CZTSSe absorber. The secondary phase causes a short circuit and deterioration of gadget performance. Following a 6-h aging period for the CZTS-PS, the average photoelectric conversion efficiency (PCE) of the device is enhanced to 8.02%, and there is also an improvement in device uniformity, as evidenced by a decrease in the standard deviation to less than 1. To inhibit the association reaction and eliminate the aging time phenomenon, a strategy is developed using hydrochloric acid to regulate the CZTS-PS environment. This strategy shifts the REDOX reaction in Cu 2+ +Sn 2+ toward the formation of Cu 1+ +Sn 4+ , leading to a decrease in the defect concentrations of V Sn (−/0) and Cu Sn (−/0), which increases the carrier concentration and reduces the impact of band tailing. The average power conversion efficiency (PCE) of the devices improved from 7.45% to 9.26%, the PCE of the best-performing CZTSSe solar cells increased from 9.25% to 9.83%, and the consistency among the devices is further enhanced, as indicated by a reduction in the standard deviation from 0.98 to 0.44. Ultimately, the device performance of the Cu 2+ +Sn 2+ -DMF system improved by 11.01% (without the MgF 2 layer) after optimization. This study serves as a reference for regulating the environment of the CZTS-PS to further enhance the CZTSSe devices' performance, and the photoelectric conversion efficiency is improved by ≈30%.
研究领域:
材料科学
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化学工程
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能源技术
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PubMed
高影响因子
ADVANCED MATERIALS
·
2025
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IF 26.8
Ting Gong,Tongtong Xuan,Wenhao Bai,Haorui Dong,Kai Huang,Rong-Jun Xie
Quantum dot (QD)-converted micrometer-scale light-emitting diodes (micro-LEDs) are regarded as an effective solution for achieving high-performance full-color micro-LED displays because of their narrow-band emission, simplified mass transfer, facile drive circuits, and low cost. However, these micro-LEDs suffer from significant blue light leakage and unsatisfactory electroluminescence properties due to the poor light conversion efficiency and stability of the QDs. Herein, the construction of green and red QD luminescence microspheres with the simultaneously high conversion efficiency of blue light and strong photoluminescence stability are proposed. These luminescence microspheres exhibit high external photoluminescence quantum yields exceeding 46% under 450 nm excitation, along with excellent reliability against blue light, heat, and water-oxygen degradation, owing to the waveguide and spatial confinement effects of the microspheres. The microsphere-based green and red micro-LEDs achieve world-record external quantum efficiencies of 40.8% and 22.1%, respectively, and high brightness values of 1.7 × 10 8 and 7.6 × 10 7 cd m −2 , respectively. Finally, 0.6 inch red, green, and blue monochrome micro-LED displays are demonstrated by integrating microsphere-converted micro-LED arrays with thin-film transistor backplanes, which show a pixel resolution as high as 1700 PPI and brightness exceeding 10 000 cd m −2 .
研究领域:
材料科学
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光电技术
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
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2015
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IF 2.288
Hao Wang,Zhiguang Guo
Hierarchical TiO 2 submicron-sized spheres (TiO 2 HSSs) with diameters of 400–600 nm were synthesized by a facile one-step solvothermal method in ethanol solvent. The HSSs composed of nanoparticles of ∼14 nm have a relatively large surface area of ∼35 m 2 /g. When applied as the scattering overlayer in dye-sensitized solar cells (DSCs), such TiO 2 HSSs effectively improved light harvesting and led to the increase of photocurrent in DSCs. Furthermore, bilayer-structured photoanode also provided fast electron transportation and long electron lifetime as confirmed by electrochemical impedance spectra. As a result, DSC based on P25 nanoparticle underlayer and HSS-2 overlayer exhibited the highest cell efficiency (6.23%) compared with ones with pure P25 (5.50%) or HSS-2 (2.00%) photoanodes.
研究领域:
材料科学
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能源科学
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2019
·
IF 2.291
Zhixin Zhang,Xinshu Luo,Jie Ding,Jingbo Zhang
Methylamine lead iodide (CH 3 NH 3 PbI 3 ) perovskite thin film solar cell has attracted much attention due to its low cost and high photoelectric conversion efficiency. Preparation of high quality perovskite thin film is the key to obtain high conversion efficiency of solar cells. Here, the pinhole-free CH 3 NH 3 PbI 3 layer with high coverage and smooth surface is prepared by the one-step solution method in air with ethylacetate as anti-solvent on an electron transport hybrid layer of TiO 2 nanoparticles coated porous carbon . The effect of ethylacetate as anti-solvent on the quality of perovskite thin film is studied in detail by comparing with chlorobenzene and ethylether. The high saturation and humidity resistance of ethylacetate in air control the nucleation and growing kinetics of perovskite crystals during the spin coating process, which facilitates the formation of uniform pinhole-free perovskite thin films. The perovskite solar cell based on the prepared high quality thin film achieves the highest conversion efficiency of 17.41% in ambient air with a relative humidity of 35%, which is superior to the perovskite thin films prepared with chlorobenzene and ethylether (conversion efficiency of 10.80% and 10.20%). The higher light-to-electric conversion efficiency is due to high coverage of the pinhole-free perovskite thin film and good contact with the electron transport layer and the hole transport layer.
研究领域:
材料科学
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能源科学
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高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 18
·期 1
·2300784
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IF 11
Taoze Wang,Yuzhen Wang,Weibin Chen,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) lighting sources are applied in non-destructive examination and illumination supplements for night monitoring. As a critical component of NIR pc-LED, NIR phosphors are required to possess a high external quantum efficiency (EQE), super thermal stability, and broadband emission to meet applications. Here, Na 2 SrGe 6 O 14 :Cr 3+ (NSGO:Cr) glass ceramics (GC) bulk via highly crystallization from glass precursor is fabricated and demonstrates an ultrabroad emission band centered at 815 nm with a full width at half-maximum (FWHM) of 214 nm and a high EQE of 49.2%. Moreover, Yb 3+ co-doping significantly enhances Cr 3+ → Yb 3+ energy transfer (ET) due to the stronger Yb 3+ : 2 F 7/2 - 2 F 5/2 absorption. Benefiting from the ET process, the Cr/Yb co-doped GC exhibits NIR-I/II emission with improved thermal stability from 30.1% to 65.0%. Furthermore, an encapsulant-free NIR GC-converted LED (GCc-LED) is prepared and exhibits 52.2 mW NIR output power with a high photoelectric conversion efficiency (PCE) of 19.4%. Under a large current of 600 mA, the NIR device exhibits a watt-level output power of 922.4 mW with a PCE of 9.1%. Compared to conventional NIR powder phosphors, NSGO:Cr/Yb GC with high performance can open up an avenue for the fabrication of high power NIR lighting sources.
研究领域:
材料科学
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光学工程
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 13
·3901-3908
·
IF 6.641
Jinchun Wang,Xueyuan Tang,Peng Zheng,Shuxing Li,Tianliang Zhou,Rong-Jun Xie
Achieving super-high brightness laser-driven solid state lighting in a transmissive mode is significantly limited by the thermal robustness and light extraction efficiency of color converter materials. Therefore, it is a must to enhance the thermal conductivity and conversion efficiency of color converters by appropriate compositional design and microstructural tailoring. In this work, we propose thermally self-managing YAG:Ce–Al2O3 composite ceramic color converters that consist of luminescent YAG:Ce phosphor particles embedded in a thermally conductive Al2O3 matrix, which allows them to be combined with high-power blue laser diodes to create super-high brightness white laser-driven light without using any heat sink. The thermal conductivity of the ceramic color converters increases linearly from 10.2 to 32.5 W m−1 K−1 as the Al2O3 content varies from 0 to 90 wt%. Impressively, the composite ceramic with 60 wt% Al2O3 can withstand an incident laser power density of up to 20.1 W mm−2. A high-brightness white laser-driven light is obtained with a luminance of 982 Mcd m−2. Moreover, the secondary Al2O3 particles also act as scattering centers and enhance the light conversion efficiency. A maximum luminous efficacy of 157 lm W−1 is achieved under 11.94 W mm−2 blue laser excitation at an Al2O3 content of 24 wt%, increased by 27.3% compared to the Al2O3-free YAG:Ce ceramic. The as-designed YAG:Ce–Al2O3 phosphor ceramics thus validate their great suitability in high-power and high-brightness laser-driven solid-state lighting.
研究领域:
材料科学
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光学工程
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高影响因子
Journal of Physics-Materials
·
2022
·Vol. 6
·期 1
·014001
·
IF 5.847
Yang Cao,Jianjun Mei,Kai Xia,Ting Zhao,Jing Zhao,Nicola Gasparini,Vincenzo Pecunia
Ongoing developments in machine vision, wearables, and the Internet of Things have led to strong demand for easy-to-fabricate, color-selective photodetectors. Narrowband-absorption-type (NBA) printable organic photodetectors provide an attractive solution, given their spectral robustness and fabrication simplicity. However, a key remaining challenge to realizing their potential is to concurrently achieve high photoconversion efficiency and spectral selectivity. Herein, this challenge is tackled by investigating a non-fullerene-based route to green-selective, solution-based photodetectors. Soluble phthalocyanine acceptor PhO-Cl6BsubPc is considered due to its high absorption selectivity to green photons. Blends with soluble quinacridones are pursued to realize the ideal of a donor:acceptor layer selectively absorbing the target photons throughout its volume. A latent-pigment route to the solution-based deposition of linear trans-quinacridone (QA) enables well-intermixed QA:PhO-Cl6BsubPc layers. Green-selective photodetectors with cutting-edge performance are thus realized, achieving a 25% increase in external quantum efficiency compared to all prior solution-based NBA implementations, as well as a nearly five-fold enhancement of the green-to-blue spectral rejection ratio. The merit of this approach is further illustrated by comparison with the corresponding fullerene-based photodetectors. By demonstrating an approach to solution-based NBA photodetectors with cutting-edge photoconversion efficiency and spectral selectivity, this study represents an important step toward printable, high-performance organic color sensors and imagers.
研究领域:
材料科学
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光电技术
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高影响因子
Solar RRL
·
2021
·Vol. 6
·期 1
·2100778
·
IF 8.582
Hongling Guo,Rutao Meng,Long Hu,Chun-Ho Lin,Yali Sun,Yue Liu,Jianyu Wu,Zhan Shen,Dewei Chu,Gang Wang,Li Wu,Guangxing Liang,Shifu Xiong,Fangfang Liu,Yi Zhang,Tom Wu
In spite of the merits such as Earth abundance and high performance, Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells suffer from unfavorable Sn Zn antisite defects and complexes, which act as nonradiative recombination centers and deteriorate the open-circuit voltage ( V OC ). Therefore, the management of Sn composition is the prerequisite for achieving high-efficiency CZTSSe photovoltaic devices. At present, the Sn-related composition and defect modifications at different selenization pressures remain unclear, which restrain the development of efficient kesterite solar cells. Herein, a facile yet effective strategy to accurately adjust the Sn content in CZTSSe films by simply optimizing the selenization pressure is demonstrated. Compared with the widely used atmospheric pressure, it is unveiled that the appropriate negative pressure (0.7 atm) can tailor the optimal Sn content in the absorber layer, influencing both the Sn-related defects and the microstructures. In contrast, a lower (0.4 atm) and a higher (1.3 atm) selenization pressure results in undesirable deep Cu Sn defects and a Sn(S,Se) 2 secondary phase, respectively. A champion device fabricated at this optimal selenization pressure (0.7 atm) exhibits a power conversion efficiency of 11.32% with a V OC of 0.496 V. This study paves the path toward highly efficient kesterite solar cells by tailoring the composition-dependent defects.
研究领域:
材料科学
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太阳能电池技术
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高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 13
·4825-4834
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IF 5.7
Huijie Wu,Sisi Liang,Weixiong You,Le Liu,Yongwei Guo,Shujian Wang,Liping Song,Zihao Wang,Haomiao Zhu
Near-infrared (NIR) phosphors with emission peak wavelength longer than 800 nm have attracted significant attention due to their wide applications. However, a key challenge lies in developing high photoluminescence (PL) thermal stability phosphors. Herein, we synthesized a NIR phosphor Na3Al2(PO4)2F3:Cr3+ (NAPOF:Cr3+) through the solid-state reaction method. The NAPOF:Cr3+ phosphor exhibits an intense broadband emission peak at 810 nm and covers a wide spectral range from 650 to 1100 nm. Notably, this phosphor demonstrates zero PL thermal quenching even at 398 K. This outstanding thermal stability can be primarily ascribed to the inherent structural rigidity and wide bandgap of the NAPOF crystal together with the medium electron–photon coupling effect. The fabricated broadband NIR light-emitting diodes (LEDs) using the NAPOF:Cr3+ phosphor exhibits a highest NIR light output power of 28.1 mW under a drive current of 150 mA, and a corresponding electro-optical conversion efficiency of 8.6%. Our findings highlight the tremendous potential of the NAPOF:Cr3+ phosphor for broad-spectrum NIR-LED applications.
研究领域:
材料科学
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光学
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高影响因子
危险品化学品经营许可证（带存储）