Lin Fang, Luo Jian, Li Zhendong, Yu Guicheng, Zhou Chao, Han Yonglei, Wu Junsheng, Wang Yongfei, Hei Xiuze, Zhou Kang, Xu Liang-Jin, Li Jingbai, Lin Haoran
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 7098 Liuxian Blvd, Nanshan District, Shenzhen, 518055, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China.
Small. 2024 Nov;20(44):e2403788. doi: 10.1002/smll.202403788. Epub 2024 Jul 12.
0D organic-inorganic metal halides (OIMHs) provide unprecedented versatility in structures and photoluminescence properties. Here, a series of bluish-white emissive 0D OIMHs, (TPE-TPP)SbBrCl (x = 1.16 to 8), are prepared by assembling the 1-triphenylphosphonium-4-(1,2,2-triphenylethenyl)benzene cation (TPE-TPP) with antimony halides anions. Based on experimental characterizations and theoretical calculations, the emission of the 0D OIMHs are attributed to the fluorescence of the organic cations with aggregation-induced emission (AIE) properties. The 0D structure minimized the molecular motion and intermolecular interactions between (TPE-TPP) cations, effectively suppressing the non-radiative recombination processes. Consequently, the photoluminescence quantum efficiency (PLQE) of (TPE-TPP)SbBrCl is significantly enhanced to 55.4% as compared to the organic salt (TPE-TPP)Br (20.5%). The PLQE of (TPE-TPP)SbBrCl can also be readily manipulated by halide substitution, due to the competitive processes between non-radiative recombination on the inorganic moiety and the energy transfer from inorganic to organic. In addition, electrically driven light-emitting diodes (LEDs) are fabricated based on (TPE-TPP)SbBrCl emitter, which exhibited bluish-white emission with a maximum external quantum efficiency (EQE) of 1.1% and luminance of 335 cd m. This is the first report of electrically driven LED based on 0D OIMH with bluish-white emission.
零维有机-无机金属卤化物（OIMHs）在结构和光致发光特性方面具有前所未有的多样性。在此，通过将1-三苯基鏻-4-（1,2,2-三苯基乙烯基）苯阳离子（TPE-TPP）与卤化锑阴离子组装，制备了一系列蓝白色发光的零维OIMHs，即（TPE-TPP）SbBrCl（x = 1.16至8）。基于实验表征和理论计算，零维OIMHs的发射归因于具有聚集诱导发光（AIE）特性的有机阳离子的荧光。零维结构使（TPE-TPP）阳离子之间的分子运动和分子间相互作用最小化，有效抑制了非辐射复合过程。因此，与有机盐（TPE-TPP）Br（20.5%）相比，（TPE-TPP）SbBrCl的光致发光量子效率（PLQE）显著提高至55.4%。由于无机部分的非辐射复合与从无机到有机的能量转移之间的竞争过程，（TPE-TPP）SbBrCl的PLQE也可以通过卤化物取代很容易地进行调控。此外，基于（TPE-TPP）SbBrCl发射体制备了电驱动发光二极管（LED），其呈现蓝白色发射，最大外量子效率（EQE）为1.1%，亮度为335 cd m。这是基于具有蓝白色发射的零维OIMH的电驱动LED的首次报道。
