Red carbon dots-based phosphors for white light-emitting diodes with color rendering index of 92

Yuechen Zhai; Yi Wang; Di Li; Ding Zhou; Pengtao Jing; Dezhen Shen; Songnan Qu

doi:10.1016/j.jcis.2018.05.101

Red carbon dots-based phosphors for white light-emitting diodes with color rendering index of 92

J Colloid Interface Sci. 2018 Oct 15:528:281-288. doi: 10.1016/j.jcis.2018.05.101. Epub 2018 May 29.

Authors

Yuechen Zhai¹, Yi Wang², Di Li³, Ding Zhou⁴, Pengtao Jing³, Dezhen Shen³, Songnan Qu⁵

Affiliations

¹ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
² College of Physics, Jilin University, Changchun 130012, PR China.
³ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China.
⁴ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China. Electronic address: zhouding@ciomp.ac.cn.
⁵ State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China. Electronic address: qusn@ciomp.ac.cn.

PMID: 29859453
DOI: 10.1016/j.jcis.2018.05.101

Abstract

Exploration of solid-state efficient red emissive carbon dots (CDs) phosphors is strongly desired for the development of high performance CDs-based white light-emitting diodes (WLEDs). In this work, enhanced red emissive CDs-based phosphors with photoluminescence quantum yields (PLQYs) of 25% were prepared by embedding red emissive CDs (PLQYs of 23%) into polyvinyl pyrrolidone (PVP). Because of the protection of PVP, the phosphors could preserve strong luminescence under long-term UV excitation or being mixed with conventional packaging materials. By applying the red emissive phosphors as the color conversion layer, WLEDs with high color rendering index of 92 and color coordinate of (0.33, 0.33) are fabricated.

Keywords: Carbon dots; High color rendering index; Phosphors; Red emission; White light-emitting diodes.