Journal
ORGANIC ELECTRONICS
Volume 71, Issue -, Pages 24-30Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2019.04.034
Keywords
White organic light-emitting diodes; Thermally activated delayed fluorescence; Deep blue; Hot exciton; Solution-processed
Funding
- National Key Research and Development Project [2016YFB0401004]
- National Science Foundation of China [61420106002, 51373189, 91833304, 21772209]
- National Program for Support of Top-notch Young Professionals
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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, CIEy similar to 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 mu s 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.
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