Anomalously Long-Lasting Blue PhOLED Featuring Phenyl-Pyrimidine Cyclometalated Iridium Emitter

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Monima Sarma
  • Wei-Lung Tsai
  • Wei-Kai Lee
  • Chung-Chih Wu
  • Shih-Hung Liu
  • Pi-Tai Chou
  • Ken-Tsung Wong

Detail(s)

Original languageEnglish
Pages (from-to)461-476
Journal / PublicationChem
Volume3
Issue number3
Online published14 Sep 2017
Publication statusPublished - 14 Sep 2017
Externally publishedYes

Abstract

Simply replacing pyridine in cyclometalating ligands in FIrpic with pyrimidine affords the complex MS 2, which has a slight red-shifted emission but shorter excited-state lifetime and the capability to form a highly efficient blue phosphorescent organic light-emitting device (OLED) with long operation lifetime (T50 > 2,200 hr). Further replacement of the picolinate-based ancillary ligand of MS 2 with strong-field CF3-containing pyridine-azole ancillary ligands leads to bluer emitters (MS 17 and MS 19) with nearly unitary photoluminescence quantum yield and preferential horizontal emitting dipole orientations (with horizontal dipole ratios of 75%–77%) beneficial for OLED optical out-coupling. OLEDs using MS 17 and MS 19 as emitters gave bluer emission and very high external quantum efficiency exceeding 31% yet with comparably short device lifetimes as FIrpic-based devices. Theoretical analysis indicates that the distinct stability of the MS 2-based device might be attributed to its relatively large energy difference between 3MC (metal center d-d transition) and 3MLCT states.

Research Area(s)

  • blue phosphorescent emitter, device lifetime, horizontal dipole, OLED, pyrimidine ligand

Citation Format(s)

Anomalously Long-Lasting Blue PhOLED Featuring Phenyl-Pyrimidine Cyclometalated Iridium Emitter. / Sarma, Monima; Tsai, Wei-Lung; Lee, Wei-Kai; Chi, Yun; Wu, Chung-Chih; Liu, Shih-Hung; Chou, Pi-Tai; Wong, Ken-Tsung.

In: Chem, Vol. 3, No. 3, 14.09.2017, p. 461-476.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review