Tuning the electronic nature of aggregation-induced emission chromophores with enhanced electron-transporting properties
作者:Yang Liu、Shuming Chen、Jacky W. Y. Lam、Faisal Mahtab、Hoi Sing Kwok、Ben Zhong Tang
DOI:10.1039/c2jm16308j
日期:——
In organic light-emitting devices, materials with efficient electron-transporting properties, are essential. In this report, oxadiazole-containing tetraphenylethene TPE-Oxa is synthesized and its optical physics and electronic properties are investigated. The dye is almost nonluminescent when molecularly dissolved in solutions, but becomes highly emissive when aggregated in poor solvents or fabricated as thin films in the solid state. A quantum yield of unity has been achieved in its solid thin film. Inherited from the oxadiazole component, the dye molecule enjoys low-lying electronic band energies. Benefiting from the good electron-transporting and hole-blocking properties of the dye, the two-layer OLED devices using TPE-Oxa as both light-emitting and electron-transporting materials show superior performance, i.e., lower turn-on voltage, higher brightness and efficiencies, to the devices of typical configuration with a dedicated electron-transporting layer.
在有机发光器件中,具有高效电子传输性能的材料至关重要。本报告中合成了含有噁二唑的四苯乙烯 TPE-Oxa,并对其光学物理和电子特性进行了研究。当该染料分子在溶液中以分子状态溶解时几乎不发光,但在贫溶剂中聚集或在固态下制成薄膜时则表现出强烈的发光能力。在其固态薄膜中已达到单一的量子产率。得益于噁二唑组分,该染料分子具有较低的电子带能。由于该染料良好的电子传输和阻孔特性,使用 TPE-Oxa 作为发光材料和电子传输材料的双层 OLED 器件表现出优越的性能,即启动电压更低、亮度和效率更高,相较于具有专用电子传输层的典型配置器件。