近日，天津大学的胡文平与中国科学院化学研究所的董焕丽等人合作并取得一项新进展。经过不懈努力，他们研制出本征白色有机偏振发光半导体。相关研究成果已于2025年1月15日在国际知名学术期刊《自然—光子学》上发表。
据悉，偏振发光介质在显示、照明和光通信等多种应用中至关重要。一个引人关注的研究方向是开发本征白色偏振发光有机半导体，作为微型偏振发光器件的理想候选材料；然而，由于缺乏合适的材料和有效的制备方法，实现偏振白光发射一直是一项相当大的挑战。
本研究通过实现白色有机偏振发光半导体单晶体（WOPESSCs）克服了这一瓶颈。研究人员采用了一种双分子掺杂方法，以高偏振性、发蓝光的2,6-二苯基蒽作为主体单晶体，并通过绿光和红光客体控制能量和偏振转移。所制备的WOPESSCs实现了38.3%的光致发光量子产率和4.9cm2V–1s–1的迁移率。发射光表现出高达0.96的偏振度，国际照明委员会坐标为（0.3258, 0.3396）。
研究人员还通过调整偏振角展示了WOPESSCs从蓝白光到黄白光的可调发射特性，以及覆盖国家电视系统委员会标准112%的宽色域三原色光学成像。此外，研究人员制造了高偏振的微尺度WOPESSCs发光二极管和发光晶体管，通过栅极电压驱动的能量转移过程，实现了高质量的白光发射和宽范围的颜色可调性。研究人员相信，这些发现为制造白色和多色偏振发光半导体以及微尺度发光器件铺平了道路，有望在各领域实现广泛应用。
附：英文原文
Title: Intrinsically white organic polarized emissive semiconductors
Author: Qin, Zhengsheng, Zhang, Yu, Wang, Tianyu, Gao, Haikuo, Gao, Can, Zhang, Xiaotao, Dong, Huanli, Hu, Wenping
Issue&Volume: 2025-01-15
Abstract: Polarized emissive media are crucial for various applications in display, lighting and optical communication. An attractive research direction is to develop intrinsically white organic polarized emissive semiconductors as ideal candidates for miniaturized polarized light-emitting devices; however, it has been a considerable challenge to achieve polarized white-light emission due to the lack of suitable materials and effective preparation methods. Here we overcome this bottleneck by realizing white organic polarized emissive semiconductor single crystals (WOPESSCs). We employ a bimolecular doping method based on using highly polarized, blue-emitting 2,6-diphenylanthracene as the host single crystal, and controlling energy and polarization transfer with green- and red-emitting guests. The fabricated WOPESSCs achieve a photoluminescence quantum yield of 38.3% and a mobility of 4.9cm2V–1s–1. The emitted light exhibits a degree of polarization as high as 0.96 with Commission Internationale de l’Eclairage coordinates of (0.3258, 0.3396). We also demonstrate the tunable emission properties of WOPESSCs from blue–white to yellow–white light by adjusting polarization angles, and three-primary-colour optical imaging with a wide colour gamut that covers 112% of the National Television System Committee standard. Furthermore, we fabricate highly polarized microscale WOPESSCs light-emitting diodes and light-emitting transistors, achieving high-quality white-light emission and wide-range colour tunability enabled by gate voltage-driven energy transfer processes. We believe these findings pave the way for manufacturing white and multicolour polarized emissive semiconductors and microscale light-emitting devices, promising diverse applications across various fields.
DOI: 10.1038/s41566-024-01609-6
Source: https://www.nature.com/articles/s41566-024-01609-6