Open AccessApplication of semiconductor quantum dots to white-light-emitting diodes
Author(s) -
Xiaoqin Gao,
Ning Zhuo,
Haibo Wang,
Yiping Cui,
Jiayu Zhang
Publication year - 2015
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.64.137801
Subject(s) - chromaticity , quantum dot , monochromatic color , color rendering index , photoluminescence , luminous efficacy , optoelectronics , light emitting diode , materials science , wavelength , color temperature , diode , optics , luminescence , semiconductor , physics , nanotechnology , layer (electronics)
Based on the electro-optical energy transfer process, the pseudo-spectral-luminous efficiency function (QD) of quantum dots (QDs) is introduced, the equations of chromaticity coordinates, luminous efficiency, and the QDs' mass of the white-light-emitting devices with CdSe, CuInS2 or CdS:Mn QDs are obtained, and the calculated results are in agreement with the experimental data. For a certain luminescent peak wavelength, when the full width at half maximum of the QD's photoluminescence becomes larger, the QD value becomes smaller while the chromaticity coordinates become more different from those of the corresponding monochromatic light. It is indicated that the color rendering index (CRI) of the devices is strongly dependent on the photoluminescent position and width of the QDs, and the CRI value can be increased towards 98 when a certain kind of CdS:Mn QDs is added into the traditional white-light LEDs.