P‐112: Improvement of White OLED Performance by Optical Enhancement Structure

Abstract

According to the demand of image quality improvement, the color gamut standard has been adjusted from DCI‐P3 to BT.2020. At present, the color gamut of some QD products can reach 80%~90%, while that of white OLED products is only about 75%. In this paper, the composite film with SiO2/SiNX distributed Bragg resonator (DBR) structure is designed and studied. The results show that the film can form a strong microcavity structure with simultaneous enhancement of RGB for white OLED devices, which overcomes the bottleneck that the strong microcavity structure can't be used in white OLED devices. It can effectively improve the performance of OLED devices, and at the same time, it has the water vapor barrier effect. It can realize the integration of multiple effects such as high color gamut, low power consumption and reliability improvement in product applications. Using the refractive index difference of SiO2/SiNx thin film, the DBR structure was fabricated by carefully designing the thickness. Based on this DBR structure, a white OLED device is fabricated. The external quantum efficiency of the device is improved, and the color gamut is up to 85% ( BT.2020), which is 11.2% higher than that of the device without DBR structure. Compared with the device without DBR structure, it has reached the QD display level, and the white light power consumption is reduced by 34.1%, HDR power consumption is reduced by 20.3%, and the overall performance is greatly improved. It provides technical support for products with high color gamut, low power consumption and long life.