Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss
| Autor: | Yong Tang, Xinrui Ding, Jiasheng Li, Yu Shudong, Jie-Xin Li, Jian Zhen Ou, Hao-Chung Kuo, Binhai Yu, Zongtao Li |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry General Engineering General Physics and Astronomy Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Luminous flux law Quantum dot Optoelectronics General Materials Science Light emission 0210 nano-technology business Luminous efficacy Refractive index Light-emitting diode Diode |
| Zdroj: | ACS Nano. 15:550-562 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.0c05735 |
| Popis: | In this study, we analyze the influence of the pore structure of an SBA-15 particle on the light emission from its inner adsorbed quantum dots (QDs) and outer light-emitting diode (LED) chips. It is found that the particle features of a high refractive index, comparable feature size of pore structure, and lower amount of QD adsorption help with QD light extraction, demonstrating a mechanism to suppress QD light propagating through pores and thus reducing the reabsorption loss. We consequently developed highly efficient QD white LEDs with wet-mixing QD/SBA-15 nanocomposite particles (NPs) by further optimizing the packaging methods and the introduced NP mass ratio. The LEDs demonstrated a record luminous efficacy (the ratio of luminous flux to electrical power) of 206.8 (entrusted test efficiency of 205.8 lm W-1 certificated by China National Accreditation Service) and 137.6 lm W-1 at 20 mA for white LEDs integrating only green QDs and green-red QD color convertors, respectively, with improved operating stability. These results are comparable to conventional phosphor-based white LEDs, which can be a starting point for white LEDs only using QDs as convertors toward commercialization in the near future. |
| Databáze: | OpenAIRE |
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