Next Article in Journal
Dynamically Temperature-Voltage Controlled Multifunctional Device Based on VO2 and Graphene Hybrid Metamaterials: Perfect Absorber and Highly Efficient Polarization Converter
Previous Article in Journal
Investigation of ZnO-decorated CNTs for UV Light Detection Applications
Previous Article in Special Issue
Room Temperature Resonant Photocurrent in an Erbium Low-Doped Silicon Transistor at Telecom Wavelength
Open AccessArticle

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

Key Laboratory of Surface Functional Structure Manufacturing of Guangdong High Education Institutes, South China University of Technology, Guangzhou 510641, China
Foshan Nationstar Optoelectronics Company, Ltd., Foshan 528000, China
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1100;
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
Show Figures

Graphical abstract

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

Back to TopTop