Highly Efficient Near-Infrared Electroluminescence up to 800 nm Using Platinum(II) Phosphors

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

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Author(s)

  • Sheng Fu Wang
  • Yi Yuan
  • Yu-Chen Wei
  • Wei-Hsiang Chan
  • Li-Wen Fu
  • Bo-Kang Su
  • I-Yun Chen
  • Keh-Jiunh Chou
  • Po-Ting Chen
  • Hsiu-Fu Hsu
  • Chang-Lun Ko
  • Wen-Yi Hung
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Article number2002173
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number30
Online published11 Jun 2020
Publication statusPublished - 23 Jul 2020

Abstract

Near-infrared organic light-emitting diodes (NIR OLEDs) enable many unique applications ranging from night-vision displays and photodynamic therapies. However, the development of efficient NIR OLEDs with a low efficiency roll-off is still challenging. Here, a series of new heteroleptic Pt(II) complexes (1–4) flanked by both pyridyl pyrimidinate and functional azolate chelates are synthesized. The reduced ππ* energy gap of the pyridyl pyrimidinate chelate, and strong intermolecular interaction and high crystallinity in vacuum-deposited thin films engender strong intermolecular charge transfer transition including metal–metal-to-ligand charge transfer; thereby, exhibiting efficient photoluminescence within 776–832 nm and short radiative lifetimes of 0.52–0.79 µs. Consequently, nondoped NIR-emitting OLEDs based on these Pt(II) complexes are fabricated, to which Pt(II) complexes 2 and 4 give record high maximum external quantum efficiency of 10.61% at 794 nm and 9.58% at 803 nm, respectively. Moreover, low efficiency roll-off is also observed, among which the device efficiencies of 2 and 4 are at least four times higher than that of the best NIR-emitting OLEDs recorded at current density of 100 mA cm−2.

Research Area(s)

  • emission, N-donor, near-infrared, platinum, pyrazole, pyrimidine, stacking interaction

Citation Format(s)

Highly Efficient Near-Infrared Electroluminescence up to 800 nm Using Platinum(II) Phosphors. / Wang, Sheng Fu; Yuan, Yi; Wei, Yu-Chen; Chan, Wei-Hsiang; Fu, Li-Wen; Su, Bo-Kang; Chen, I-Yun; Chou, Keh-Jiunh; Chen, Po-Ting; Hsu, Hsiu-Fu; Ko, Chang-Lun; Hung, Wen-Yi; Lee, Chun-Sing; Chou, Pi-Tai; Chi, Yun.

In: Advanced Functional Materials, Vol. 30, No. 30, 2002173, 23.07.2020.

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