Multi-zinc oxide-cores@uni-barium sulfate-shell with improved photo-, thermal-, and ambient-stability: Non-equilibrium sorption fabrication and light-emitting diodes application

Ya-Chuan Liang; Kai-Kai Liu; Xue-Ying Wu; Xian-Li Lu; Ying-Jie Lu; Qi Zhao; Chong-Xin Shan

doi:10.1016/j.jcis.2018.05.100

Multi-zinc oxide-cores@uni-barium sulfate-shell with improved photo-, thermal-, and ambient-stability: Non-equilibrium sorption fabrication and light-emitting diodes application

J Colloid Interface Sci. 2018 Nov 1:529:1-10. doi: 10.1016/j.jcis.2018.05.100. Epub 2018 May 29.

Authors

Ya-Chuan Liang¹, Kai-Kai Liu², Xue-Ying Wu¹, Xian-Li Lu¹, Ying-Jie Lu¹, Qi Zhao³, Chong-Xin Shan⁴

Affiliations

¹ School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China.
² State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No. 3888 Dongnanhu Road, Changchun 130033, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address: liukaikai@ciomp.ac.cn.
³ School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China. Electronic address: zhaoqi@126.com.
⁴ School of Physics and Engineering, Zhengzhou University, Zhengzhou 450001, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address: cxshan@zzu.edu.cn.

PMID: 29879677
DOI: 10.1016/j.jcis.2018.05.100

Abstract

ZnO as an eco-friendly material shows bright luminescence under UV illumination when it is tailored into nanoscale size, which makes it a promising luminescent nanomaterial. However, the poor stability of ZnO hinders its applications drastically. In this work, multi-ZnO-cores@uni-BaSO₄-shell (mZnO@uBaSO₄) nanocomposite has been prepared through a non-equilibrium sorption process employing ZnO QDs as the "seeds" and BaSO₄ as the "valve". The mZnO@uBaSO₄ nanocomposite shows improved photo-, thermal- and ambient-stability compare with bare ZnO QDs. The fluorescence efficiency of the mZnO@uBaSO₄ nanocomposite decreases little even after 60 h of UV irradiation compare with ZnO QDs. The mZnO@uBaSO₄ nanocomposite shows bright luminescence with little decrease even the ambient temperature up to 160 °C and the nanocomposite shows strong resistance to harsh environment. By coating the mZnO@uBaSO₄ nanocomposite and commercial phosphors onto UV-chip, light-emitting diode (LED) with correlated color temperature, Commission Internationale de L'Eclairage coordinate, color rendering index and luminous efficiency of 6109 K, (0.32, 0.33), 85 and 47.33 lm/W have been realized, and this will make a great step towards eco-friendly UV-pumped LEDs.

Keywords: Light-emitting diodes; Phosphors; mZnO@uBaSO(4) nanocomposite.