A New Entry to Purely Organic Thermally Activated Delayed Fluorescence Emitters Based on Pyrido[2, 3‐b]pyrazine‐Dihydrophenazasilines Donor‐Acceptor Dyad. Issue 3 (19th February 2022)

• Record Type: Journal Article
• Authors: Goya, Tsuyoshi; Zimmermann Crocomo, Paola; Hosono, Takumi; Minakata, Satoshi; de Sousa, Leonardo Evaristo; de Silva, Piotr; Data, Przemyslaw; Takeda, Youhei
• Is Part Of: Asian journal of organic chemistry. Volume 11:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-19
• Subjects: thermally activated delayed fluorescence -- donor-acceptor -- charge-transfer -- OLED -- azaheterocycle; Chemistry, Organic -- Periodicals; Organic compounds -- Synthesis -- Periodicals; 547.005
• DOI: 10.1002/ajoc.202100780
• Languages: English
• ISSNs: 2193-5807

Abstract

Abstract: A new family of thermally activated delayed fluorescence (TADF) emitters based on a twisted donor‐acceptor (D−A) dyad scaffold comprising of dihydrophenazasiline (D) and pyrido[2, 3‐ b ]pyrazine (A) has been developed, and their properties have been investigated. Time‐resolved spectroscopic analysis in matrices revealed the detailed photophysical properties of the D−A compounds. These D−A compounds serve as the emitter for organic light‐emitting diodes (OLEDs), showing a moderate external quantum efficiency (EQE) up to 9% in CBP matrix. Furthermore, theoretical calculations uncovered the excited states nature of the developed TADF emitters. Abstract : A new family of twiste d donor‐acceptor type thermally activated delayed fluorescence (TADF) emitters comprising of pyrido[2, 3‐ b ]pyrazine as the acceptor and dihydrophenazasilines as the donor has been developed. The organic light‐emitting diodes fabricated the developed emitters achieved a high external quantum efficiency up to 9%. Theoretical calculations implied the intermediacy of a high triplet excited state for efficient TADF.