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Open AccessArticle

Effect of Excitation Wavelength on Optical Performances of Quantum-Dot-Converted Light-Emitting Diode

1
Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510641, China
2
Foshan Nationstar Optoelectronics Company, Ltd., Foshan 528000, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1100; https://doi.org/10.3390/nano9081100
Received: 10 July 2019 / Revised: 24 July 2019 / Accepted: 25 July 2019 / Published: 1 August 2019
(This article belongs to the Special Issue Optoelectronic Nanodevices)
Light-emitting diode (LED) combined with quantum dots (QDs) is an important candidate for next-generation high-quality semiconductor devices. However, the effect of the excitation wavelength on their optical performance has not been fully explored. In this study, green and red QDs are applied to LEDs of different excitation wavelengths from 365 to 455 nm. The blue light is recommended for exciting QDs from the perspective of energy utilization. However, QD LEDs excited at 365 nm have unique advantages in eliminating the original peaks from the LED chip. Moreover, the green or red light excited by ultraviolet light has an advantage in colorimetry. Even for the 455 nm LED with the highest QD concentration at 7.0 wt%, the color quality could not compete with the 365 nm LED with the lowest QD concentration at 0.2 wt%. A 117.5% (NTSC1953) color gamut could be obtained by the 365 nm-excited RGB system, which is 32.6% higher than by the 455 nm-excited solution, and this can help expand the color gamut of LED devices. Consequently, this study provides an understanding of the properties of QD-converted LEDs under different wavelength excitations, and offers a general guide to selecting a pumping source for QDs. View Full-Text
Keywords: colorimetry; excitation wavelength; light-emitting diode; quantum dots colorimetry; excitation wavelength; light-emitting diode; quantum dots
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MDPI and ACS Style

Yan, C.; Du, X.; Li, J.; Ding, X.; Li, Z.; Tang, Y. Effect of Excitation Wavelength on Optical Performances of Quantum-Dot-Converted Light-Emitting Diode. Nanomaterials 2019, 9, 1100.

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