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<p>Recently, organic persistent room-temperature phosphorescence (OPRTP), entailing triplet-state emission from purely organic units instead of luminescent heavy metal complexes, has emerged as a promising alternative for the development of emitting materials in organic light-emitting diodes (OLEDs). For OPRTP-based devices to achieve acceptable performances, the low emission efficiency caused by weak spin-orbit coupling and high sensitivity to external environmental factors, such as temperature, moisture, and oxygen must be overcome. Herein, four-coordinate N-heterocyclic carbene Pt(II) complexes bearing carbazole (Cz) or naphthalene (Np) groups were assembled and found to exhibit exothermic triplet-triplet energy transfer (TTET) from the high triplet metal-to-ligand charge transfer (<sup>3</sup>MLCT) state (T<sub>1</sub> = 2.97 eV) of the Pt core to the lower triplet states (T<sub>1</sub> = 2.58–2.87 eV) of the tethered organic Cz and Np moieties. The presented design strategy enables the persistent organic phosphorescence of organic molecules under ambient conditions and triplet electroluminescence of the organic group via TTET in OLED applications.</p><p></p>

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Organic phosphorescence in Pt(II)-complexes linked to organic chromophores for blue-emitting organic light-emitting diodes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月9日

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  • Seong Woon Jeong,
  • Hyung Joo Lee,
  • Bum June Park,
  • Min-Jong Bong,
  • Daehan Lee,
  • Taekyung Kim,
  • Chul Hoon Kim,
  • Ho-Jin Son

摘要

Recently, organic persistent room-temperature phosphorescence (OPRTP), entailing triplet-state emission from purely organic units instead of luminescent heavy metal complexes, has emerged as a promising alternative for the development of emitting materials in organic light-emitting diodes (OLEDs). For OPRTP-based devices to achieve acceptable performances, the low emission efficiency caused by weak spin-orbit coupling and high sensitivity to external environmental factors, such as temperature, moisture, and oxygen must be overcome. Herein, four-coordinate N-heterocyclic carbene Pt(II) complexes bearing carbazole (Cz) or naphthalene (Np) groups were assembled and found to exhibit exothermic triplet-triplet energy transfer (TTET) from the high triplet metal-to-ligand charge transfer (3MLCT) state (T1 = 2.97 eV) of the Pt core to the lower triplet states (T1 = 2.58–2.87 eV) of the tethered organic Cz and Np moieties. The presented design strategy enables the persistent organic phosphorescence of organic molecules under ambient conditions and triplet electroluminescence of the organic group via TTET in OLED applications.