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Abstract：
Organic thermally activated delayed fluorescence (TADF) materials have been widely investigated due to their impressive electronic properties and applied potential for the third generation of organic light-emitting diodes (OLED). We present organic TADF material (4BGIPN) based on the strained benzoguanidine donor and compare it with the benchmark carbazole-based material (4CzIPN). Extended π-conjugation in 4BGIPN material results in yellow-green luminescence at 512 nm with a fast radiative rate of 5.5 × 10-5 s-1 and a photoluminescence quantum yield of 46% in methylcyclohexane solution. Such a nitrogen-rich 4BGIPN material has a significantly stabilized highest occupied molecular orbital (HOMO) at -6.4 eV while the lowest unoccupied molecular orbital (LUMO) at -4.0 eV, indicating potential suitability for application as the electron transport layer or TADF class III emitter in OLEDs.
摘要：
有机热激活延迟荧光（TADF）材料由于其令人印象深刻的电子特性和第三代有机发光二极管（OLED）的应用潜力而得到了广泛的研究。我们提出了基于应变苯并胍供体的有机TADF材料（4BGIPN），并将其与基准咔唑基材料（4CzIPN）进行了比较。4BGIPN材料中的扩展π共轭在512nm处产生黄绿色发光，在甲基环己烷溶液中的快速辐射速率为5.5×10-5s-1，光致发光量子产率为46％。这种富氮4BGIPN材料在-6.4eV时具有显著稳定的最高占据分子轨道(HOMO)，而在-4.0eV时具有最低未占据分子轨道(LUMO)。这表明作为OLED中的电子传输层或TADFIII类发射体的潜在适用性。
