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<p>We reported Ir(III) complexes featuring a dicarbene pincer chelate, a bidentate carbene cyclometalate (with either <i>N</i>-benzyl or <i>N</i>-mesityl appendage) and a halide (X<sup>−</sup> = Cl<sup>−</sup>, Br<sup>−</sup> and I<sup>−</sup>), for probing the structure-property relationship. They exhibit blue emission with the peak<sub>max</sub> spanning 465–480 nm in toluene at RT. Particularly, <b>[Ir(DP)(MC5H)Cl]</b> and <b>[Ir(DP)(MS1)Cl]</b> showed the best performance among these Ir(III) emitters due to the high MLCT and LC components and relatively diminished XLCT contribution. This is evidenced by high photoluminescent quantum yield (PLQY) of 60% and 73% and fast radiative rate constant (<i>k</i><sub>r</sub> = 6.7 × 10<sup>6</sup> and 2.0 × 10<sup>6</sup> s<sup>−1</sup>). Phosphorescent organic light-emitting diode (PhOLED) devices based on 20 wt% of <b>[Ir(DP)(MC5H)Cl]</b> and <b>[Ir(DP)(MS1)Cl]</b> exhibited the maximum external quantum efficiency (EQE<sub>max</sub>) of 26.1% and 22.0% with peak<sub>max</sub> at 506 and 468 nm, respectively. Additionally, hyper-OLED featuring sensitizer <b>[Ir(DP)(MS1)Cl]</b> and terminal emitter v-DABNA afforded narrowband blue emission with EQE<sub>max</sub> of 26.9% and the International Commission on Illumination (CIE) coordinates of (0.129, 0.157).</p>

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Halide and steric effects on Ir(III) carbene phosphors for blue organic light-emitting diodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月16日

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  • Jie Yan,
  • Manli Huang,
  • Martin Kuhn,
  • Muyu Zhou,
  • Xinyu Li,
  • Yufeng Sang,
  • Guowei Ni,
  • Jinsong Jiang,
  • Kai Li,
  • Xiuwen Zhou,
  • Chuluo Yang,
  • Yun Chi

摘要

We reported Ir(III) complexes featuring a dicarbene pincer chelate, a bidentate carbene cyclometalate (with either N-benzyl or N-mesityl appendage) and a halide (X− = Cl−, Br− and I−), for probing the structure-property relationship. They exhibit blue emission with the peakmax spanning 465–480 nm in toluene at RT. Particularly, [Ir(DP)(MC5H)Cl] and [Ir(DP)(MS1)Cl] showed the best performance among these Ir(III) emitters due to the high MLCT and LC components and relatively diminished XLCT contribution. This is evidenced by high photoluminescent quantum yield (PLQY) of 60% and 73% and fast radiative rate constant (kr = 6.7 × 106 and 2.0 × 106 s−1). Phosphorescent organic light-emitting diode (PhOLED) devices based on 20 wt% of [Ir(DP)(MC5H)Cl] and [Ir(DP)(MS1)Cl] exhibited the maximum external quantum efficiency (EQEmax) of 26.1% and 22.0% with peakmax at 506 and 468 nm, respectively. Additionally, hyper-OLED featuring sensitizer [Ir(DP)(MS1)Cl] and terminal emitter v-DABNA afforded narrowband blue emission with EQEmax of 26.9% and the International Commission on Illumination (CIE) coordinates of (0.129, 0.157).