文章采用具有电子捕捉能力的橙红色磷光材料iridium(Ⅲ)bis(2-methyldibenzo-[f,h]quinoxaline)(acetylacetonate)(Ir(MDQ)2(acac))作为超薄发光层应用于有机发光二极管中。通过对其厚度的优化, 发现当发光层厚度为0.1 nm时, 器件性能最好, 最大电流效率达到了28.1 cd/A, 明显优于采用掺杂发光层的器件。分析了发光材料的载流子捕捉作用对器件载流子平衡及器件电流效率的影响, 发现超薄发光层结构几乎不改变器件的电学特性, 不会进一步破坏器件载流子平衡, 正因如此, 大多数磷光材料都可以采用超薄发光层获得很高的效率。

基于新型有机p型掺杂的电荷产生层, 制备了叠层式白光有机发光二极管（OLED）。有机p型掺杂层具有很高的导电率, 可以在不影响器件电学特性的前提下, 通过改变该层的厚度来优化白光OLED的器件性能, 调节器件的光色。与传统白光OLED相比, 文章研究的叠层式白光OLED制备工艺简单、电荷产生效率高, 可应用于平板显示与固态照明。

溶液法制备的有机发光二极管(OLED)虽然有着制作成本低、材料利用率高以及容易大规模生产等优势, 但是在器件效率上离传统高温真空热蒸镀法制作的OLED还有很大差距。文章基于一种新型的磷光发光材料Ir(tfmppy)2(tpip), 在利用单一主体材料溶液法制备OLED时发现器件效率不高, 同时效率滚降很大。为了提高器件效率, 同时减小效率滚降, 以多种材料混合作为主体材料。通过改变混合主体材料间的比例关系, 以一种简单的器件结构, 采用溶液法制作出了高效率的OLED器件。其中, 以质量比为7∶21∶12的PVK∶mCP∶TCTA为混合主体材料, 掺杂质量比为10%的Ir(tfmppy)2(tpip)作为发光层的器件, 取得了高达55cd/A的电流效率。

通过将氧化石墨烯(Graphene Oxide, GO)与十二烷基苯磺酸钠(Sodium Dodecyl Benzene Sulfonate, SDBS)作为填料混入聚3,4-乙撑二氧噻吩∶聚苯乙烯磺酸 (PEDOT∶PSS) 溶液中制备了高透光率和低方块电阻的透明导电薄膜。当氧化石墨烯与PEDOT∶PSS质量比为0.02%时, 薄膜获得了最佳的导电率, 电阻为85Ω/□, 在550nm的光波长下透光率为87%。采用不同掺杂比例的薄膜作为电极制备了有机发光二极管 (OLED) 器件, 相比于常用的ITO电极, 复合薄膜作为阳极更有利于空穴的注入和传输, 所制备的器件能够得到更优的性能。这些结果表明 PEDOT∶PSS和氧化石墨烯复合电极有望取代柔性OLED器件中的ITO阳极。

A multiplexed holographic display video has been achieved by using a passive azo-dye-doped liquid crystal (LC) cell. Holograms formed in this cell can be refreshed in the order of several milliseconds. By angular multiplexing technique, dynamically multiplexed holographic videos are realized. Moreover, the reconstructed RGB images are merged into a color image, which illustrates the possibility of a color holographic three-dimensional (3D) display by holographic multiplexing of the LC cell.

We demonstrate by finite-difference time-domain simulations that a one-dimensional (1D) photonic crystal (PC) structure between glass substrate and indium tin oxide layer can improve the light extraction efficiency of organic light-emitting diodes. The extraction efficiency depends on the emitters' positions varying laterally in a unit cell of PC. The highest efficiency is obtained when the emitters are under higher refractive index strips. Efficiency decreases when the emitters shift to lower refractive index strips. Simulations for both transverse magnetic and transverse electric modes indicate that when emitters are close to the middle of the higher refractive index strips, the guided wave transmits with less divergence and inhibited reflection because of the guiding effect of higher refractive index strips. A modified method that considers the position effects is proposed to calculate the extraction efficiency more precisely.