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Optical and Photonic Materials
Water-stable CsPbBr
3
perovskite quantum-dot luminous fibers fabricated by centrifugal spinning for dual white light illumination and communication
Download:561次
Binhai Yu
1
Shunming Liang
1
Fengyi Zhang
1
Zongtao Li
1,2
[ ... ]
Xinrui Ding
1,*
Author Affiliations
Abstract
1
National and Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510641, China
2
Provincial Key Laboratory of Semiconductor Micro Display, Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China
3
Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou 510006, China
Lead halide perovskite quantum dots (PQDs) display remarkable photoelectric performance. However, defects such as weak stability in air and water environments limit the development of lead halide PQDs in solid-state light applications. Herein, centrifugal spinning is used for the fabrication of stable luminous
CsPbBr
3
PQD nanofibers. After immersion in water for 11 months, the PQD fibers still maintained considerable photoluminescence quantum yield, showing high stability in hostile environments. The water-stability mechanism of the fibers can be explained by the changing defect density, crystal growth of PQDs, and the molecular transformation at the fiber surface. The white LED based on the
CsPbBr
3
fibers exhibits satisfying color gamut performance (128% of National Television System Committee). Due to the short photoluminescence lifetime of
CsPbBr
3
PQDs, the communication potential is also considered. The
CsPbBr
3
fibers obtained by centrifugal spinning present a bandwidth of 11.2 MHz, showing promising performance for solid-state light and visible light communication applications.
PDF全文
Full Text
Photonics Research
2021, 9(8): 08001559
Review
Review of blue perovskite light emitting diodes with optimization strategies for perovskite film and device structure
Download:1244次
Zongtao Li
1,2,*
Kai Cao
1
Jiasheng Li
1,2
Yong Tang
1
[ ... ]
Binhai Yu
1
Author Affiliations
Abstract
1
National & Local Joint Engineering Research Center of Semiconductor Display and Optical Communication Devices, South China University of Technology, Guangzhou 510640, China
2
Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China.
Perovskite light emitting diodes (PeLEDs) have attracted considerable research attention because of their external quantum efficiency (EQE) of >20% and have potential scope for further improvement. However, compared to red and green PeLEDs, blue PeLEDs have not been extensively investigated, which limits their commercial applications in the fields of luminance and full-color displays. In this review, blue-PeLED-related research is categorized by the composition of perovskite. The main challenges and corresponding optimization strategies for perovskite films are summarized. Next, the novel strategies for the design of device structures of blue PeLEDs are reviewed from the perspective of transport layers and interfacial layers. Accordingly, future directions for blue PeLEDs are discussed. This review can be a guideline for optimizing perovskite film and device structure of blue PeLEDs, thereby enhancing their development and application scope.
perovskite light emitting diodes
perovskite film
device structure
blue LEDs
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Opto-Electronic Advances
2021, 4(2): 02200019
Light-emitting Diodes
Enhanced optical and thermal performance of white light-emitting diodes with horizontally layered quantum dots phosphor nanocomposites
Download:913次
Shudong Yu
1,4
Yong Tang
1
Zongtao Li
1,2,*
Kaihang Chen
1
[ ... ]
Binhai Yu
1
Author Affiliations
Abstract
1
Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510640, China
2
Optoelectronics Engineering Technology Research and Development Center, Foshan Nationstar Optoelectronics Co. Ltd., Foshan 528000, China
3
Department of Mechanical Engineering, University of California, Berkeley, California 94720, USA
4
Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, Karlsruhe 76131, Germany
Due to their good color rendering ability, white light-emitting diodes (WLEDs) with conventional phosphor and quantum dots (QDs) are gaining increasing attention. However, their optical and thermal performances are still limited especially for the ones with QDs-phosphor mixed nanocomposites. In this work, we propose a novel packaging scheme with horizontally layered QDs-phosphor nanocomposites to obtain an enhanced optical and thermal performance for WLEDs. Three different WLEDs, including QDs-phosphor mixed type, QDs-outside type, and QDs-inside type, were fabricated and compared. With 30 wt. % phosphor and 0.15 wt. % QDs nanocomposite, the QDs-outside type WLED shows a 21.8% increase of luminous efficiency, better color rendering ability, and a 27.0% decrease of the maximum nanocomposite temperature at 400 mA, compared with the mixed-type WLED. The reduced re-absorption between phosphor and QDs is responsible for the performance enhancement when they are separated. However, such reduced absorption can be traded off by the improper layered configuration, which is demonstrated by the worst performance of the QDs-inside type. Further, we demonstrate that the higher energy transfer efficiency between excitation light and nanocomposite in the QDs-outside type WLED is the key reason for its enhanced optical and thermal performance.
Nanomaterials
Optical materials
Semiconductor materials
Fluorescent and luminescent materials
Light-emitting diodes
Microstructure fabrication
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Full Text
Photonics Research
2018, 6(2): 02000090
Optical Devices
High-efficiency LED COB device combined diced V-shaped pattern and remote phosphor
Download:1266次
Zongtao Li
1
Huiyu Wang
1
Binhai Yu
1,*
Xinrui Ding
2
Yong Tang
1
Author Affiliations
Abstract
1
The Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510641, China
2
The Department of Mechanical Engineering, University of California at Berkeley, Berkeley, California 94720-5800, USA
To further improve the luminous efficiency of LED lightings, this Letter proposes a chip-on-board (COB) device by combining diced staggered V-shaped patterns and remote phosphors. The results show that the V-shaped patterned COB (V-COB) with vertex angles from 120o to 150o can achieve a
~
17
%
output power increase (OPI) compared to the conventional COB. V-COB remote phosphor devices (RPDs) are then manufactured and tested. The luminous efficiency of the proposed RPD represents an 11.6% increase at the correlated color temperature of
~
3000
K
. Such an improvement can be attributed to both the decreases of total internal reflections and phosphor backscatterings.
230.3670
Light-emitting diodes
220.0220
Optical design and fabrication
250.5230
Photoluminescence
PDF全文
Full Text
Chinese Optics Letters
2017, 15(4): 042301
Angular color uniformity enhancement of white light-emitting diodes by remote micro-patterned phosphor film
Download:1572次
Shudong Yu
1,2
Zongtao Li
1,2,*
Guanwei Liang
1
Yong Tang
1
[ ... ]
Kaihang Chen
1
Author Affiliations
Abstract
1
Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510640, China
2
Optoelectronics Engineering Technology Research and Development Center, Foshan Nationstar Optoelectronics Co. Ltd., Foshan 528000, China
Angular color uniformity (ACU) is a key factor used to evaluate the light quality of white-light emitting diodes (LEDs). In this study, a novel double remote micro-patterned phosphor film (double RMPP film) was used to enhance the ACU of a remote phosphor (RP) down-light lamp. A conventional RP film and remote phosphor film with single micro-patterned film (single RMPP film) also were examined for comparison. The angular correlated color temperature (CCT) distributions and the optical performance of the films were experimentally measured. The measurement results showed that double RMPP film configuration exhibited better color uniformity with a CCT deviation of only 441 K, compared with 556 K for the single RMPP film configuration and 1390 K for the RP film configuration. A simulation based on FDTD and ray tracing combined method also confirmed the ACU improvement. In addition, compared with the conventional RP film, the luminous efficiency of single and double RMPP film configurations was increased by 6.68% and 4.69%, respectively, at a driving current of 350 mA. The enhancement of the ACU and luminous efficiency are due to the scattering and mixing effect of the micropatternedfilm. Moreover, the double RMPP film configuration had better CCT stability at different currents than the other two configurations. The results demonstrated the effectiveness and superiority of double RMPP film in white LED applications.
Light-emitting diodes
Light-emitting diodes
Microstructure fabrication
Microstructure fabrication
Fluorescent and luminescent materials
Fluorescent and luminescent materials
Scattering
Scattering
PDF全文
Full Text
Photonics Research
2016, 4(4): 04000140
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