Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.
Small. 2017 May;13(19). doi: 10.1002/smll.201604110. Epub 2017 Mar 10.
Organic semiconductor micro-/nanocrystals with regular shapes have been demonstrated for many applications, such as organic field-effect transistors, organic waveguide devices, organic solid-state lasers, and therefore are inherently ideal building blocks for the key circuits in the next generation of miniaturized optoelectronics. In the study, blue-emissive organic molecules of 1,4-bis(2-methylstyryl)benzene (o-MSB) can assemble into rectangular microcrystals at a large scale via the room-temperature solution-exchange method. Because of the Förster resonance energy transfer, the energy of the absorbed photons by the host matrix organic molecules of o-MSB can directly transfer to the dopant organic molecules of tetracene or 1,2:8,9-dibenzopentacene (DBP), which then emit visible photons in different colors from blue to green, and to yellow. More impressively, by modulating the doping molar ratios of DBP to o-MSB, bright white-emissive organic microcrystals with well-preserved rectangular morphology can be successfully achieved with a low doping ratio of 1.5%. These self-assembled organic semiconductor microcrystals with multicolor emissions can be the white-light sources for the integrated optical circuits at micro-/nanoscale.
具有规则形状的有机半导体微/纳晶体已经在许多应用中得到了证明，例如有机场效应晶体管、有机波导器件、有机固态激光器，因此它们本质上是下一代小型化光电子学中关键电路的理想构建模块。在这项研究中，蓝色发光有机分子 1,4-双（2-甲基苯乙烯基）苯（o-MSB）可以通过室温溶液交换方法大规模组装成矩形微晶体。由于Förster 共振能量转移，o-MSB 主体基质有机分子吸收的光子能量可以直接转移到掺杂有机分子苝或 1,2:8,9-二苯并戊搭烯（DBP）上，然后它们会发出从蓝色到绿色再到黄色的不同颜色的可见光。更令人印象深刻的是，通过调节 DBP 与 o-MSB 的掺杂摩尔比，可以以低掺杂比 1.5%成功获得具有良好保存的矩形形态的明亮白色发射有机微晶。这些具有多色发射的自组装有机半导体微晶体可以成为微/纳米尺度集成光电路的白光光源。
