White Light-Emitting Diodes Based on AgInS₂/ZnS Quantum Dots with Improved Bandwidth in Visible Light Communication

Cheng Ruan; Yu Zhang; Min Lu; Changyin Ji; Chun Sun; Xiongbin Chen; Hongda Chen; Vicki L Colvin; William W Yu

doi:10.3390/nano6010013

White Light-Emitting Diodes Based on AgInS₂/ZnS Quantum Dots with Improved Bandwidth in Visible Light Communication

Nanomaterials (Basel). 2016 Jan 8;6(1):13. doi: 10.3390/nano6010013.

Authors

Cheng Ruan¹, Yu Zhang², Min Lu³, Changyin Ji⁴, Chun Sun⁵, Xiongbin Chen⁶, Hongda Chen⁷, Vicki L Colvin⁸, William W Yu^{9

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Affiliations

¹ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. rc_yinuo@163.com.
² State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. yuzhang@jlu.edu.cn.
³ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. lumin15@mails.jlu.edu.cn.
⁴ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. jcy_168@126.com.
⁵ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. sunspring.518@163.com.
⁶ State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China. chenxiongbin@semi.ac.cn.
⁷ State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China. hdchen@semi.ac.cn.
⁸ Department of Chemistry, Brown University, Providence, RI 02912, USA. colvin@rice.edu.
⁹ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China. wyu6000@gmail.com.
¹⁰ Department of Chemistry and Physics, Louisiana State University, Shreveport, LA 71115, USA. wyu6000@gmail.com.

Abstract

Quantum dot white light-emitting diodes (QD-WLEDs) were fabricated from green- and red-emitting AgInS₂/ZnS core/shell QDs coated on GaN LEDs. Their electroluminescence (EL) spectra were measured at different currents, ranging from 50 mA to 400 mA, and showed good color stability. The modulation bandwidth of previously prepared QD-WLEDs was confirmed to be much wider than that of YAG:Ce phosphor-based WLEDs. These results indicate that the AgInS₂/ZnS core/shell QDs are good color-converting materials for WLEDs and they are capable in visible light communication (VLC).

Keywords: AgInS2/ZnS; color stability; modulation bandwidth; quantum dot; visible light communication; white light-emitting diode (WLED).