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Exceptionally stable blue phosphorescent organic light-emitting diodes
- Title
- Exceptionally stable blue phosphorescent organic light-emitting diodes
- Authors
- Sun J.; Ahn H.; Kang S.; Ko S.-B.; Song D.; Um H.A.; Kim S.; Lee Y.; Jeon P.; Hwang S.-H.; You Y.; Chu C.
- Ewha Authors
- 유영민
- SCOPUS Author ID
- 유영민
- Issue Date
- 2022
- Journal Title
- Nature Photonics
- ISSN
- 1749-4885
- Citation
- Nature Photonics vol. 16, no. 3, pp. 212 - 218
- Publisher
- Nature Research
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Blue phosphorescent organic light-emitting diodes (PhOLEDs) can deliver superior electroluminescence efficiencies than blue fluorescent OLEDs; however, their commercial debut has been delayed by short device lifetimes, especially for deep-blue PhOLEDs with Commission International de l’Eclairage y co-ordinates of less than 0.20. Here we report the use of new dopant and host materials to create a blue PhOLED device with a y co-ordinate of 0.197 and a long device lifetime of LT70 = 1,113 h [Initial luminance (L0) = 1,000 cd m–2]. Introducing bulky 3,5-di-tert-butyl-phenyl into the N-heterocyclic carbene moiety in the Pt(II) complex enhanced the photochemical stability of the high-lying metal-centred triplet state and prevented undesirable host–guest interactions, contributing to a longer device lifetime and higher colour purity. For the exciplex-forming host, the hole-transporting and electron-transporting host materials utilized a triphenylsilyl group for enhanced stability, which also improved the device lifetime. © 2022, The Author(s), under exclusive licence to Springer Nature Limited.
- DOI
- 10.1038/s41566-022-00958-4
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
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