White light-emitting diodes based on carbon dots and Mn-doped CsPbMnCl3 nanocrystals. (26th March 2019)

• Record Type: Journal Article
• Authors: Gao, Zhiyuan; Sun, Chun; Liu, Hanxin; Shi, Shuangshuang; Geng, Chong; Wang, Le; Su, Sijing; Tian, Kangkai; Zhang, Zi-hui; Bi, Wengang
• Is Part Of: Nanotechnology. Volume 30:Number 24(2019)
• Publication Date: 2019-03-26
• Subjects: perovskite -- nanocrystals -- WLEDs -- carbon dots; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab0b01
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: CsPbX3 perovskite nanocrystals (NCs) are becoming a promising material for optoelectronic devices that possess an optically tunable bandgap, and bright photoluminescence. However, the toxic Pb is not environmentally friendly and the quantum yield (QY) of blue emitting NCs is relatively low. In addition, the red emitting perovskite containing iodine is not stable under light illumination. In this paper, high QY, blue emitting, non-toxic fluorescent nanomaterial carbon dots and orange-emitting CsPb0.81 Mn0.19 Cl3 NCs with partial Pb replacement are combined to fabricate white light-emitting diodes (WLEDs). A WLED with color coordinates of (0.337, 0.324) and a correlated color temperature of 4804 K is fabricated. Compared to red emitting perovskite containing iodine, the CsPb0.81 Mn0.19 Cl3 NCs are stable no matter whether they are stored in the air or exposed under ultraviolet light. Therefore, the as-fabricated WLED shows good color stability against increasing currents and long-term working stability.