The development of deep-blue electroluminescent fluorescent materials with solution-processability and small molecule has exerted a great influence on the application in organic light-emitting diodes (OLED) field. However, so far there still lack of small molecule deep-blue materials suitable for solution-processed OLEDs and its wide band gap and low carrier mobility are requisite. Notably, the poor solvent resistance of small molecule usually incurs the inter-layer corrosion while using solution process to deposit multiple layers, which would result in poor device performance. In this work, a cross-linkable deep-blue light-emitting material DPCS-DPS containing diphenylsulfone/carbazole units and styrene groups has been designed and synthesized. The hole and electron transport parts composed of diphenylsulfone/carbazole exhibited bipolar charge-transporting properties, and the styrene group exhibited good solvent-resistance after thermal cross-linking, which is beneficial for the preparation of subsequent functional layers by solution process. By using the DPCS-DPS, the non-doped OLED achieved deep-blue emission wavelength of 415 nm, and the doped device approached a maximum current efficiency of 1.19 cd A⁻¹ and maximum power efficiency of 0.75 lm W⁻¹.

具有溶液加工性和小分子的深蓝色电致发光荧光材料的发展对有机发光二极管（OLED）领域的应用产生了重大影响。但是，到目前为止，仍然缺少适用于溶液处理的OLED的小分子深蓝色材料，并且其宽带隙和低载流子迁移率是必需的。值得注意的是，小分子的不良耐溶剂性通常在使用溶液工艺沉积多层时引起层间腐蚀，这将导致不良的器件性能。在这项工作中，已经设计并合成了包含二苯砜/咔唑单元和苯乙烯基团的可交联的深蓝色发光材料DPCS-DPS。由二苯砜/咔唑组成的空穴和电子传输部分表现出双极性电荷传输性质，并且在热交联之后，苯乙烯基表现出良好的耐溶剂性，这对于通过溶液法制备后续功能层是有利的。通过使用DPCS-DPS，未掺杂的OLED实现了415 nm的深蓝色发射波长，并且该掺杂的器件的最大电流效率接近1.19 cd A^-1和0.75 lm W ^-1的最大功率效率。