Lin Kai-Chen, Lee Wei-Kai, Wang Bo-Kai, Lin Yu-Hsing, Chen Hsien-Hung, Song Yi-Hwa, Huang Yu-Hsin, Shih Li-Wei, Wu Chung-Chih
Opt Express. 2021 Mar 1;29(5):7654-7665. doi: 10.1364/OE.418105.
Sunlight/UV (ultraviolet)-induced degradation is still a critical issue for outdoor applications of organic light-emitting diode (OLED) displays. Therefore, effective UV-blocking structures that can prevent OLED displays from sunlight/UV degradation and still keep the OLED panels' display performance is necessary. In this report, modified distributed Bragg reflector (DBR) structures having UV-absorbing dielectric materials and adjusted layer/pair thicknesses were developed to realize effective UV blocking properties (nearly 0% transmittance below 400 nm), constantly high transmittance like glass in the visible range (∼92%) required for display applications, and sharp transition in transmission between the UV and the visible ranges. Furthermore, under the rigorous IEC 60068-2-5 solar test condition, it was verified that the developed modified, UV-blocking DBR can effectively enhance the OLED panel's resistance against UV/solar-induced degradation, effectively reducing voltage shifts of OLED devices after repeated solar test cycles.
阳光/紫外线（UV）诱导的降解对于有机发光二极管（OLED）显示器的户外应用而言仍是一个关键问题。因此，需要有效的紫外线阻挡结构，既能防止OLED显示器因阳光/紫外线而降解，又能保持OLED面板的显示性能。在本报告中，我们开发了具有紫外线吸收介电材料且调整了层/对厚度的改性分布式布拉格反射器（DBR）结构，以实现有效的紫外线阻挡性能（在400 nm以下的透过率接近0%）、在显示应用所需的可见光范围内（约为92%）像玻璃一样持续保持高透过率，以及在紫外线和可见光范围之间实现透射率的急剧转变。此外，在严格的IEC 60068-2-5太阳能测试条件下，验证了所开发的改性紫外线阻挡DBR能够有效增强OLED面板抵抗紫外线/阳光诱导降解的能力，在反复进行太阳能测试循环后能有效降低OLED器件的电压偏移。
