Isomeric spiro-[acridine-9,9′-fluorene]-2,6-dipyridylpyrimidine based TADF emitters : insights into photophysical behaviors and OLED performances

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

7 Scopus Citations
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Author(s)

  • Paramaguru Ganesan
  • Deng-Gao Chen
  • Jia-Ling Liao
  • Wei-Cheng Li
  • Yi-Ning Lai
  • Dian Luo
  • Chih-Hao Chang
  • Chang-Lun Ko
  • Wen-Yi Hung
  • Shun-Wei Liu
  • Gene-Hsiang Lee
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Pages (from-to)10088-10100
Journal / PublicationJournal of Materials Chemistry C
Volume6
Issue number37
Early online date30 Aug 2018
Publication statusPublished - 7 Oct 2018

Abstract

TADF molecules with a higher horizontal-dipole ratio have recently been realized to show a large conversion efficiency in organic light-emitting diodes (OLEDs) and hence great promise for their application in display and solid state lighting sources. The current work focuses on fine-tuning the structure of the parent 2,6-diphenylpyrimidinyl compound PhPMAF and its derivatives with a series of 2,6-dipyridylpyrimidine acceptors; namely: 2NPMAF, 3NPMAF and 4NPMAF, among which the intramolecular CH⋯N bonding interaction was confirmed for 2NPMAF, showing good agreement with the NMR results. The solvatochromism and TADF behaviors, together with TD-DFT computations, of the titled compounds were explored to gain insights into the structure-photophysics relationship. Eventually, these functional 2,6-dipyridylpyrimidine acceptor based TADF compounds exhibit electroluminescence ranging from deep-blue to sky-blue, among which an external quantum efficiency (EQE) of 24.9% was achieved for the derivative 3NPMAF. The high horizontal-dipole ratios (∼0.86-0.91) obtained for this class of compounds elucidates the superior OLED performance. Moreover, the non-doped OLED architecture achieves an EQE of 14.1% for 3NPMAF, which is superior to that of PhPMAF with an EQE of 5.1%, demonstrating the significance of dipyridylpyrimidine as an acceptor for the future structural design of TADF emitters.

Citation Format(s)

Isomeric spiro-[acridine-9,9′-fluorene]-2,6-dipyridylpyrimidine based TADF emitters : insights into photophysical behaviors and OLED performances. / Ganesan, Paramaguru; Chen, Deng-Gao; Liao, Jia-Ling; Li, Wei-Cheng; Lai, Yi-Ning; Luo, Dian; Chang, Chih-Hao; Ko, Chang-Lun; Hung, Wen-Yi; Liu, Shun-Wei; Lee, Gene-Hsiang; Chou, Pi-Tai; Chi, Yun.

In: Journal of Materials Chemistry C, Vol. 6, No. 37, 07.10.2018, p. 10088-10100.

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