Efficient Red Light Emitting Diodes Based on a Zero‐Dimensional Organic Antimony Halide Hybrid
Efficient Red Light Emitting Diodes Based on a Zero‐Dimensional Organic Antimony Halide Hybrid
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基于零维有机卤化锑混合物的高效红光发光二极管
DOI：
10.1002/adma.202209417
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发表时间：
2023
影响因子：
29.4
通讯作者：
Fatima, Iqra
中科院分区：
文献类型：
--
作者：
Liu, He;Shonde, Tunde Blessed;Gonzalez, Fabiola;Olasupo, Oluwadara Joshua;Lee, Sujin;Luong, Derek;Lin, Xinsong;Vellore Winfred, J. S. Raaj;Lochner, Eric;Fatima, Iqra
零维有机金属卤化物杂化材料(OMHHs)是近年来出现的一类具有优异颜色可调性的新型发光材料。虽然大量的OMHH通常可以获得接近单位的光致发光量子效率(PLQE)，但将它们作为电驱动发光二极管(LED)的发射体仍然具有挑战性，这主要是由于宽禁带有机阳离子的低电导。本文报道了由半导体有机阳离子(TPPcarz+)和发光溴化锑阴离子(Sb2Br82−)组成的新型有机发光材料三苯基(9-苯基-9H-咔唑-3-基)溴化膦(TPPcarzSbBr4)的研制。通过用电活性苯基咔唑取代四苯基膦(TPP+)中的一个苯基，发展了一种半导体TPPcarz+阳离子，用于制备0D红光TPPcarzSbBr4单晶，其PLQE高达93.8%。用溶液处理的TPPcarzSbBr4薄膜(PLQE为86.1%)作为发光层，制备的红光LED的外量子效率为5.12%，峰值亮度为5957ncd m−2，电流效率为14.2ncd A−1，这是迄今为止报道的基于OMHs的电致发光器件的最佳值。
Zero‐dimensional (0D) organic metal halide hybrids (OMHHs) have recently emerged as a new class of light emitting materials with exceptional color tunability. While near‐unity photoluminescence quantum efficiencies (PLQEs) are routinely obtained for a large number of 0D OMHHs, it remains challenging to apply them as emitter for electrically driven light emitting diodes (LEDs), largely due to the low conductivity of wide bandgap organic cations. Here, the development of a new OMHH, triphenyl(9‐phenyl‐9H‐carbazol‐3‐yl) phosphonium antimony bromide (TPPcarzSbBr4), as emitter for efficient LEDs, which consists of semiconducting organic cations (TPPcarz+) and light emitting antimony bromide anions (Sb2Br82−), is reported. By replacing one of the phenyl groups in a well‐known tetraphenylphosphonium cation (TPP+) with an electroactive phenylcarbazole group, a semiconducting TPPcarz+cation is developed for the preparation of red emitting 0D TPPcarzSbBr4single crystals with a high PLQE of 93.8%. With solution processed TPPcarzSbBr4thin films (PLQE of 86.1%) as light emitting layer, red LEDs are fabricated to exhibit an external quantum efficiency (EQE) of 5.12%, a peak luminance of 5957 cd m−2, and a current efficiency of 14.2 cd A−1, which are the best values reported to date for electroluminescence devices based on 0D OMHHs.