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A thermally activated delayed fluorescent platinum(ii) complex for red organic light emitting diodes with high efficiencies and small roll-off 相关领域
荧光
铂金
激发态
有机发光二极管
红灯
二极管
光电子学
材料科学
金属
电荷(物理)
发光二极管
化学
光化学
纳米技术
光学
生物化学
生物
催化作用
原子物理学
物理
图层(电子)
植物
量子力学
冶金
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Abstract Although phosphorescent Pt(II) complexes have shown great potential for organic light-emitting diodes (OLEDs), red phosphorescence with a high photoluminescence quantum yield (PLQY) and a short emission lifetime is still scarce because of the limitation on the radiative decay rate. Transition metal complexes have proved advantageous for emitting thermally activated delayed fluorescence (TADF), but TADF Pt(II) complexes have rarely been reported. Herein, we describe the design and synthesis of two red TADF Pt(II) complexes, namely Pt-tCzDBPZ (Pt1) and Pt2-tCzDBPZ (Pt2). By using a donor–acceptor type monodentate ligand, the complexes have metal-perturbed intraligand charge-transfer (MPICT) excited states featuring small singlet–triplet energy gaps (0.086–0.089 eV) and a moderately large spin–orbit coupling matrix element (∼10 cm−1). The complexes exhibit red TADF emissions (ca. 630 nm) with high 。。。。。。。 |
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(2025-6-4)