Exceptionally stable blue phosphorescent organic light-emitting diodes

Jinwon Sun, Heechoon Ahn, Sunwoo Kang, Soo Byung Ko, Dayoon Song, Hyun Ah Um, Sungbum Kim, Yoonkyoo Lee, Pyungeun Jeon, Seok Hwan Hwang, Youngmin You, Changwoong Chu, Sunghan Kim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalNature Photonics
Volume16
Issue number3
DOIs
StatePublished - Mar 2022

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