Photonics
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2023
·Vol. 10
·期 10
·1113
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IF 2.4
Junhu Cai,Xiaogang Chen,Wenyan Zhang,Longwen Yang,Zexi Lin,Wenxiao Zhao,Yun Ye,Sheng Xu,Tailiang Guo,Enguo Chen
Owing to their composition-tunable and narrow emissions and high photoluminescence quantum yield (PLQY), inorganic halide perovskite quantum dots (IPQDs) are a promising option for wide color gamut displays. However, their practical applications have been limited by their lattice structure instability and surface defect states. Herein, CsPbBr3:KBF4@SiO2with improved stability and optical properties is successfully synthesized with a two-step optimization of fluorine (F) anion doping and SiO2in situ coating. Compared with bromide (Br), higher electronegativity and a smaller radius of F lead to stronger binding energy with Pb2+. Also, F anions can occupy surface Br vacancies. Then, benefiting from the acidic environment provided by BF4−hydrolysis, tetraethyl orthosilicate (TEOS) can be more easily hydrolyzed on the CsPbBr3:KBF4surface to generate SiO2coating, thus further passivating lattice defects and improving environmental stability. Importantly, the PLQY of CsPbBr3:KBF4@SiO2achieves 85%, and the stability has been greatly improved compared with pure CsPbBr3. Finally, CsPbBr3:KBF4@SiO2/PDMS, CsPbI3/PDMS, and CsPbCl3/PDMS composites with narrow emissions are applied to replace traditional phosphors as color converters for direct-view light-emitting diode (LED) displays or liquid crystal display (LCD) backlights. The color gamut reaches 118.22% under the NTSC standard. Concerning the display field, it suggests likely applications in the future.Keywords:CsPbBr3;KBF4;SiO2;wide color gamut;liquid crystal displays;LED displays
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
IEEE Photonics Journal
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2025
·Vol. 17
·期 2
·1-7
·
IF 2.4
Zong-Tao Li,Yi-Hua Qiu,Jia-Sheng Li,Jin-Cheng Li,Bin-Hai Yu,Xin Zhu,Xin-Rui Ding
Highly light-absorbed encapsulation is generally used to eliminate the ambient light for light-emitting diode (LED) display devices, it is challenging to simultaneously achieve a high ambient contrast ratio (ACR) and high light output efficiency (LOE). To solve this problem, we propose an inverted packaging structure for LED display devices. The LED chips’ emitting surface is mounted on the transparent carrier board (TCB) while the backside is packaged by the composite encapsulation, causing that the substrate is inverted to the topside of devices. As a result, the chips can emit light directly from the TCB and avoid the absorption loss of the encapsulation, leading to the high ACR and LOE performances. Compared to traditional devices, the inverted device showed an average increase of over 800% in luminous flux (LF) and LOE, and an average increase of over 390% in ACR. Additionally, the devices exhibited excellent soldering performance, corrosion resistance, airtightness, and thermal stability. This novel device overcomes the bottleneck of achieving both high ACR and high LOE, providing new insights for the development of LED display technology. Future work can further optimize the structure and materials of the TCB and composite encapsulation to enhance device performance.
研究领域:
光学工程
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材料科学
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电子工程
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高影响因子
ACS Photonics
·
2025
·
IF 6.7
Zijun Yan,Yuhui Wang,Shibiao Liu,Wenan Guo,Guolong Chen,Xiaotong Fan,Yue Lin,Shuli Wang,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu
Quantum dot (QD) color conversion layers (CCLs) present an economical and reliable approach to achieve full-color micro-LED displays. Microfluidic technology demonstrates significant advantages for patterning and integrating multicolor QDs, including high precision, rapid processing, low material consumption, and low fabrication costs. However, preparing high-resolution CCLs with low optical crosstalk remains challenging due to limitations in microfluidic chip design induced by swelling of polydimethylsiloxane (PDMS) microchannels in nonpolar solvents utilized for QD dispersion. In this study, we developed a QD solution with a polymer additive that effectively suppresses PDMS swelling, making injection of QD solution into small-sized PDMS microchannels on chromium-patterned microhole glass substrates possible. The resulting QD CCLs exhibit high luminescence uniformity and a high resolution of 1285 ppi, with a subpixel dimension of 5 μm × 5 μm, which is the smallest dimension reported for CCLs fabricated by microfluidic technology. Furthermore, our innovative integration of chromium-patterned microhole glass substrates within a microfluidic device provides unprecedented optical isolation, effectively eliminating intersubpixel crosstalk in CCLs. By integrating optimized red and green QD CCLs with a blue GaN micro-LED array, we successfully fabricated a full-color micro-LED prototype with a resolution of 600 ppi and a wide color gamut of 115% NTSC. Owing to their high resolution, uniform luminescence, and low optical crosstalk, the proposed microfluidic technology holds significant promise for advancing next-generation full-color micro-LED displays.
研究领域:
材料科学
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纳米技术
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微流控技术
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光电子学
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高影响因子
Nano Energy
·
2022
·
IF 19.069
Tongtong Xuan,Shaoqiang Guo,Wenhao Bai,Tianliang Zhou,Le Wang,Rong-Jun Xie
Although tremendous efforts have been made to enhance the stability of lead halide perovskite quantum dots (PeQDs), they cannot meet the long-term requirements of photoelectric devices due to their poor reliability when attacked by multiple factors. Herein, we report ultrastable CsPbBr 3 :Sr/PbBr(OH)/molecular sieve composites with a high photoluminescence quantum yield of 75% and high overall stability when exposed to water, blue light and heat, owing to (i) the increased formation energy of CsPbBr 3 PeQDs by Sr doping and (ii) good encapsulation by PbBr(OH) and molecular sieves. These composites maintain 54% of their initial intensity after being aged at 85 °C and 150 mW cm −2 for 720 min, which is superior to commercial green CdSe-based QDs. These promising composites are then used to produce Mini-LED backlights with a high luminous efficacy of 86 lm/W and a color area of ~124% of the National Television Standards Committee or 93% of the Rec. 2020 standards by combining them with red CdSe/CdS/ZnS QDs and a blue Mini-LED chip. We believe that highly reliable PeQDs can be achieved by building well-designed composite structures, thus enabling them to be practically applied in emerging lighting and displays.
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
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