Enhancing the exciton emission of CsPbCl3 perovskite quantum dots by incorporation of Rb+ ions. (April 2019)

• Record Type: Journal Article
• Authors: Zhao, Zhenyu; Xu, Wen; Pan, Gencai; Liu, Yanan; Yang, Mu; Hua, Siwei; Chen, Xu; Peng, Hongshang; Song, Hongwei
• Is Part Of: Materials research bulletin. Volume 112(2019)
• Page Start: 142
• Page End: 146
• Publication Date: 2019-04
• Subjects: Perovskite quantum dots -- Rb+doping -- Improved -- Photoluminescence quantum yields; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2018.12.004
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: The Rb + ions were successfully incorporated into the lattice of CsPbCl3 quantum dots, and the photoluminescence quantum yields of CsPbCl3 quantum dots was improved from 5.7% to 13% through the optimization of Rb + doping concentration. Highlights: The Rb + ions were successfully incorporated into the lattice of CsPbCl3 QDs with partially substituting the sites of Cs + ions. The PLQYs of CsPbCl3 QDs was improved from 5.7% to 13% through the optimization of Rb + doping concentration. This work offers a new approach to improve the optical performance of perovskite QDs. Abstract: All-inorganic perovskite quantum dots have wide application prospects in the fields of lighting and display. However, the photoluminescence quantum yields of violet-blue emission for the CsPbCl3 quantum dots is still low. In this work, the Rb + ions were successfully incorporated into the lattice of CsPbCl3 quantum dots with partially substituting the sites of Cs + ions by the modified hot injection method. It was interesting to observe that the photoluminescence quantum yields of CsPbCl3 quantum dots was improved from 5.7% to 13% through the optimization of Rb + doping concentration. The absorption and emission peaks of CsPbCl3 quantum dots shifted to blue, originating from lattice substitution of Cs + with Rb + . Further investigation on the photoluminescence dynamics of the quantum dots revealed that the enhanced photoluminescence quantum yields resulted from the reduced defects in CsPbCl3 :Rb quantum dots. This work offers a new approach to improve the optical performance of perovskite quantum dots.