White-light-emitting diodes using GaN-excited CdSe/CdS/ZnS quantum dots--颗粒学报PARTICUOLOGY

Lin, Y., Zhang, Y., Zhao, J., Gu, P., Bi, K., Zhang, Q., Chu, H., Zhang, T., Cui, T., Wang, Y., Zhao, J., & Yu, W. W. (2014). White-light-emitting diodes using GaN-excited CdSe/CdS/ZnS quantum dots. Particuology, 15, 90–93. https://doi.org/10.1016/j.partic.2013.01.009

White-light-emitting diodes using GaN-excited CdSe/CdS/ZnS quantum dots

Yijun Lin ^a, Yu Zhang^{a b *}, Jia Zhao ^a, Pengfei Gu b, Ke Bi ^b, Qiuran Zhang ^a, Hairong Chu ^c, Tieqiang Zhang ^b, Tian Cui ^b, Yiding Wang ^a, Jun Zhao ^d, William W. Yu ^{a d e *}

a State Key Laboratory on Integrated Optoelectronics, and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
b State Key Laboratory of Superhard Materials, and College of Physics, Jilin University, Changchun 130012, China
c Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130025, China
d Department of Chemistry and Physics, Louisiana State University, Shreveport, LA 71115, USA
e College of Material Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

10.1016/j.partic.2013.01.009

Volume 15, August 2014, Pages 90-93

Received 31 October 2012, Revised 13 January 2013, Accepted 25 January 2013, Available online 15 June 2013.

E-mail: yuzhang@jlu.edu.cn; wyu6000@gmail.com

Highlights

• WLEDs were fabricated using blue GaN chips and green- and red-emitting CdSe/CdS/ZnS quantum dots.

• Warm and cold white emissions were confirmed with color temperature from 4000 to 9000 K.

• Variation of color coordinates and color temperature were investigated and analyzed at deferent bias.

• Stability of white emission was analyzed with the increase of working time.

Abstract

Fluorescence-based white-light-emitting diodes (WLEDs) were fabricated using blue GaN chips and green- and red-emitting CdSe/CdS/ZnS quantum dots (QDs). The coordinate and color temperature of the WLEDs could be varied because of the size-tunable emission of CdSe QDs from 510 to 620 nm. Warm and cold white emissions were confirmed with the color temperature ranging from 4000 to 9000 K. Color coordinates were analyzed at different bias. The fast enhancement of blue emission resulted in the shift of color coordinates to the cold side. The stability of white emission during operation was analyzed; stable spectra were achieved within 90 min.

Graphical abstract

Keywords

GaN; Quantum dots; White-light-emitting diode; Stability

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