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Solution-processed white organic light-emitting diodes with bi-component emitting layer based on symmetry blue spiro-sulfone derivative.
- Source :
-
Organic Electronics . Aug2019, Vol. 71, p24-30. 7p. - Publication Year :
- 2019
-
Abstract
- We report a white organic light-emitting diode (WOLED) of simple construction with a bi-component emitting layer, in which a novel, dual-role deep blue TADF emitter as both the non-doped blue emitter and efficient host of an orange TADF emitter of TXO-TPA. The deep blue molecule (SDPS-4PhCz, CIE y ∼ 0.04) was designed using spiro-diphenylsulfone (SDPS) as electron-accepting group and four 9-phenyl-9H-carbazole (N-PhCz) as the electron-donating groups. SDPS-4PhCz showed delayed fluorescence with short delayed lifetime of 1.4 μs via fast reverse intersystem crossing (RISC) from "hot exciton" triplet excited state. The solution-processed, non-doped deep blue inverted OLED device exhibited a maximum EQE of 4.92% with low efficiency roll-off. The two-color WOLED with extremely simple device architecture showed an EQE above 17%, CIE (0.39, 0.44) and high CRI of 64 by spin-coating method. Image 1 • A new deep blue emitter via a spiro concept was designed. • The non-doped deep blue OLED showed a low efficiency roll-off. • The fast RISC process in SDPS-4PhCz coincided with "hot exciton" mechanism. • The two-color WOLED showed an EQE above 17% by spin-coating method. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DELAYED fluorescence
*LIGHT emitting diodes
*DIODES
Subjects
Details
- Language :
- English
- ISSN :
- 15661199
- Volume :
- 71
- Database :
- Academic Search Index
- Journal :
- Organic Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 136744589
- Full Text :
- https://doi.org/10.1016/j.orgel.2019.04.034