AI 中文总结
针对玻璃态固体不稳定性的技术限制，研究发现通过控制物理气相沉积（PVD）温度可将有机半导体Alq3的PVD玻璃抗结晶能力提高至少10倍，为解决OLED器件结晶失效提供了新策略。
AI 中文摘要
玻璃态固体的不稳定性是其在多项技术应用中使用的关键限制因素。通过物理气相沉积（PVD）制备的堆积紧密的有机玻璃近来受到关注，因为它们比传统方法制备的玻璃具有显著更高的热稳定性和化学稳定性。本文表明PVD玻璃还可表现出增强的抗结晶能力：通过控制沉积温度，模型有机半导体Alq3（三（8-羟基喹啉）铝）的PVD玻璃的抗结晶能力可提高至少一个数量级。Alq3的PVD玻璃在结晶前先转变为过冷液体，通过控制沉积温度，我们延长了玻璃向液体的转变时间，从而也延长了整体结晶时间。因此，我们展示了一种稳定有机半导体玻璃抗结晶的新策略，而结晶是OLED（有机发光二极管）器件中常见的失效机制。
英文摘要
The instability of glassy solids poses a key limitation to their use in several technological applications. Well-packed organic glasses, prepared by physical vapor deposition (PVD), have drawn attention recently because they can exhibit significantly higher thermal and chemical stability than glasses prepared from more traditional routes. We show here that PVD glasses can also show enhanced resistance to crystallization. By controlling the deposition temperature, resistance towards crystallization can be enhanced by at least a factor of ten in PVD glasses of the model organic semiconductor Alq3 (Tris(8-hydroxyquinolinato) aluminum). PVD glasses of Alq3 first transform into a supercooled liquid before crystallizing. By controlling the deposition temperature, we increase the glass to liquid transformation time thereby also increasing the overall time for crystallization. We thus demonstrate a new strategy to stabilize glasses of organic semiconductors against crystallization, which is a common failure mechanism in OLED (organic light emitting diode) devices.
Comments22 pages, 4 figures, 50 references; Supporting information with 10 figures
Journal refJ. Phys. Chem. B 2021, 125, 461-466
