期刊
ACS NANO
卷 15, 期 1, 页码 550-562出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c05735
关键词
quantum dot; light-emitting diode; luminous efficacy; reabsorption; wide-color gamut
类别
资金
- National Natural Science Foundation of China [51775199, 51735004]
- Science & Technology Program of Guangdong Province [2020B0101030008]
- Project of Science and Technology New Star in Zhujiang Guangzhou City [2018-06010102]
The study shows that high refractive index, pore structure with comparable size, and lower QD adsorption amount contribute to enhanced QD light extraction efficiency. By optimizing packaging methods and NP mass ratio, highly efficient QD white LEDs were developed, achieving luminous efficacy comparable to phosphor-based white LEDs and paving the way for commercialization of white LEDs solely using QDs as converters in the future.
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 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.
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