White light-emitting devices based on ZnCdS/ZnS and perovskite nanocrystal heterojunction. (28th August 2019)

• Record Type: Journal Article
• Authors: Wang, Congcong; Xue, Dingke; Shen, Xinyu; Wu, Hua; Zhang, Yu; Cui, Haining; Yu, William W
• Is Part Of: Nanotechnology. Volume 30:Number 46(2019)
• Publication Date: 2019-08-28
• Subjects: perovskite -- LED -- white light -- nanocrystal -- heterojunction; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ab39b2
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Perovskite white light-emitting devices (WLEDs) without intercalation layers have not been achieved due to the ion exchange. Although the intercalation layers prevent ion exchange between perovskite nanocrystals (NCs), it also creates a new problem of charge imbalance and the structure becomes more complex. In this study, blue emitting ZnCdS/ZnS NCs with high quantum yield and stability are introduced to work with the yellow emission from CsPb(Br/I)3 perovskite NCs for WLEDs. The WLEDs are constituted of ITO/ZnO/PEI/ZnCdS/ZnS NCs/CsPb(Br/I)3 NCs/TCTA/MoO3 /Au. This design avoids ion exchange between different perovskites NCs, and realizes white light emission by simple fabrication. As a result, we achieved the white light coordinates of (0.34, 0.34) and a correlated color temperature of 5153 K.