title: Monochromatic and electrochemically switchable electrochemiluminescence of perovskite CsPbBr3nanocrystals.
abstract: Cubic-shaped perovskite CsPbBr3nanocrystals (NCs) could be electrochemically injected with holes (or electrons) to produce several charged states under different oxidizing and reducing potentials, and then bring out electrochemiluminescence (ECL) of higher color purity than traditional ECL chemicals and metal chalcogenide NCs, in both annihilation and co-reactant routes. The difference of electrochemical gaps between varied hole and electron injecting potentials displayed little effect on the ECL spectrum and colour purity of CsPbBr3NCs. All the excited states generated under different oxidizing and reducing potential couples in ECL of CsPbBr3NCs were the same as those in photoluminescence, as all the ECL spectra were almost identical to the CsPbBr3NCs' photoluminescence spectrum. Importantly, the ECL of CsPbBr3NCs was electrochemically switchable and displayed an obvious "on/off" type feature by changing the sequence of hole injecting and electron injecting processes, as strong ECL could be obtained by injecting holes onto the electron injected NCs, while no or very weak ECL was obtained in the reversed way.
authors: School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China. zouguizheng@sdu.edu.cn and Department of Chemistry, Liaocheng University, Liaocheng, 252059, China.
authors: Yan
authors: Y
authors: Huang
authors: School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China. zouguizheng@sdu.edu.cn.
authors: Mingxiang
authors: M
authors: Fang
authors: School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China. zouguizheng@sdu.edu.cn.
authors: Guizheng
authors: http://orcid.org/0000-0002-3295-3848
authors: G
authors: Zou
authors: School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China. zouguizheng@sdu.edu.cn.
authors: Bin
authors: B
authors: Zhang
authors: Department of Chemistry, Liaocheng University, Liaocheng, 252059, China.
authors: Huaisheng
authors: H
authors: Wang