Clarification of the Molecular Doping Mechanism in Organic Single‐Crystalline Semiconductors and their Application in Color‐Tunable Light‐Emitting Devices. Issue 43 (10th September 2018)

• Record Type: Journal Article
• Authors: Ding, Ran; Wang, Xue‐Peng; Feng, Jing; Li, Xian‐Bin; Dong, Feng‐Xi; Tian, Wei‐Quan; Du, Jia‐Ren; Fang, Hong‐Hua; Wang, Hai‐Yu; Yamao, Takeshi; Hotta, Shu; Sun, Hong‐Bo
• Is Part Of: Advanced materials. Volume 30:Issue 43(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-10
• Subjects: color‐tunable crystal‐based OLEDs -- first‐principles calculations -- molecular doping mechanism -- organic single crystals -- polarized photoluminescence; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201801078
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Organic single‐crystalline semiconductors with long‐range periodic order have attracted much attention for potential applications in electronic and optoelectronic devices due to their high carrier mobility, highly thermal stability, and low impurity content. Molecular doping has been proposed as a valuable strategy for improving the performance of organic semiconductors and semiconductor‐based devices. However, a fundamental understanding of the inherent doping mechanism is still a key challenge impeding its practical application. In this study, solid evidence for the " perfect " substitutional doping mechanism of the stacking mode between the guest and host molecules in organic single‐crystalline semiconductors using polarized photoluminescence spectrum measurements and first‐principles calculations is provided. The molecular host–guest doping is further exploited for efficient color‐tunable and even white organic single‐crystal‐based light‐emitting devices by controlling the doping concentration. The clarification of the molecular doping mechanism in organic single‐crystalline semiconductor host–guest system paves the way for their practical application in high‐performance electronic and optoelectronic devices. Abstract : A fundamental understanding of the molecular doping mechanism in organic single‐crystalline semiconductors is provided using polarized PL spectrum measurement and first‐principles calculations. Color‐tunable and white single‐crystal‐based organic light‐emitting devices with high performance are realized, which have important implications for the practical application of organic single‐crystalline semiconductors.