噻唑主體材料實現高效率綠色有機發光二極體

Thiazole-based hosts for the realization of efficient green-emitting OLEDs

本研究提出了三種雙極性主體材料，其採用2-苯基苯並[d]噻唑作為受體，結合不同的供體分子組成，這些主體材料設計目的是賦予平衡的載子傳輸能力和足夠的能隙，使其可搭配綠色磷光客體，結果顯示，採用BTZ-CZ為主體、Ir(ppy)3為客體的元件具有最優異的元件表現: 26.3%的最高外部量子效率、2.6 V的低啟動電壓和192,557 cd/m2的最大亮度，這歸因於BTZ-CZ平衡載子的傳輸能力，有助於擴大載子複合區域，降低空間中的激子濃度，從而減少三重態-三重態湮滅狀況，這些結果顯示本研究所開發的主體材料在實現高效率OLED具有很大的潛力。

Three bipolar host materials were proposed, consisting of 2-phenylbenzo[d]thiazole acceptor and different donor moieties. These materials are designed to endow themselves with balanced carrier transport capabilities and sufficient band gaps for green phosphors. As a result, the Ir(ppy)3-based device with BTZ-CZ host exhibited excellent performance, such as high peak efficiency of 26.3%, a low turn-on voltage of 2.6 V, and high maximum luminance of 192,557 cd/m2. Furthermore, the balanced carrier transport capability of BTZ-CZ can help expand the recombination region and thereby reduce triplet-triplet annihilation. These results implied that these molecular designs have a high potential for realizing efficient OLEDs.