White light emitting device based on single-phase CdS quantum dots

Nanotechnology
Feng LiQinghua Li

Abstract

White light emitting diodes (WLEDs) based on quantum dots (QDs) are emerging as robust candidates for white light sources, however they are suffering from the problem of energy loss resulting from the re-absorption and self-absorption among the employed QDs of different peak wavelengths. It still remains a challenging task to construct WLEDs based on single-phase QD emitters. Here, CdS QDs with short synthesis times are introduced to the fabrication of WLEDs. With a short synthesis time, on one hand, CdS QDs with a small diameter with blue emission can be obtained. On the other hand, surface reconstruction barely has time to occur, and the surface is likely defect-ridden, which enables the existence of a broad emission covering the range of green, yellow and red regions. This is essential for the white light emission of CdS QDs, and is very important for WLED applications. The temporal evolution of the PL spectra for CdS QDs was obtained to investigate the influence of growth time on the luminescent properties. The CdS QDs with a growth time of 0.5 min exhibited a colour rendering index (CRI) of 79.5 and a correlated colour temperature (CCT) of 6238 K. With increasing reaction time, the colour coordinates of the CdS QDs will mo...Continue Reading

References

Feb 28, 2002·Journal of the American Chemical Society·Lianhua Qu, Xiaogang Peng
Nov 3, 2005·Journal of the American Chemical Society·Michael J BowersSandra J Rosenthal
Jul 29, 2006·Angewandte Chemie·Jonathan S SteckelMoungi G Bawendi
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Mar 12, 2016·Nanoscale·Keke QiaoJiang Tang
Feb 9, 2017·Journal of the American Chemical Society·Chaodan PuXiaogang Peng

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Citations

Aug 29, 2018·ACS Applied Materials & Interfaces·Michael WorkuBiwu Ma

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