State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
Chem Asian J. 2012 Oct;7(10):2424-8. doi: 10.1002/asia.201200489. Epub 2012 Jul 24.
Polycyclic aromatic hydrocarbons (PAHs) normally exhibit efficient fluorescence in dilute solutions, whereas their emission is significantly quenched in the aggregated state due to the formation of π-aggregates/excimers. The rigid and planar structure of PAHs plays a positive role in terms of fluorescence in solution but a negative one in the aggregated state. To bestow PAHs a luminescent ability in the solid state, we constructed a non-coplanar PAH-substituted ethene. By using the planar PAH fluoranthene as a building block, a highly efficient solid-state emitter with a fluorescence quantum efficiency of unity in the aggregated state was obtained. OLEDs with contain the molecule as an emitter reach a luminance up to 20 520 cd m(-2) and an efficiency of 10 cd A(-1).
多环芳烃 (PAHs) 在稀溶液中通常表现出高效的荧光，而由于 π-聚集体/激基复合物的形成，其发射在聚集态时会显著猝灭。PAHs 的刚性和平面结构对溶液中的荧光具有积极作用，但对聚集态则具有消极作用。为了赋予 PAHs 在固态下的发光能力，我们构建了一个非共面的 PAH 取代乙烯。通过使用平面 PAH 荧蒽作为构建块，获得了一种具有高效固态发射能力的化合物，其在聚集态下的荧光量子效率达到 1。包含该分子作为发射体的 OLED 达到了 20520cd/m2 的亮度和 10cd/A 的效率。
