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Chen, Yung-Chung; Yen, Jui-Hua; Wang, Yi-Jyun; Hsieh, Chung-An; Chen, Li-Yin
Organic electronics, August 2021, 2021-08-00, Volume: 95Journal Article
In this work, light extraction efficiency of organic light-emitting diodes (OLEDs) with a spin-coated polyimide/porous silica hybrids were enhanced. The polyimide/porous silica thin films (C1 and C2) were accomplished by spin coating a hybrid film composed of a polyimide-silica composite blended with various amount of porous silica nanoparticles into the opposite site of ITO glass. The optical, thermal, and morphology properties were controlled by adding various amount of porous silica. The incorporation of light extraction layer improved the maximum external quantum efficiency (EQE) by as much as 24.8% based on integrating sphere measurement condition when compared to that of a reference device without a light extraction layer. Furthermore, the device utilizing the light extraction layer showed identical EL spectra as the reference device did. Additionally, the optical emission distribution of the device was close to the Lambertian profile. The polyimide/porous silica hybrids demonstrated in this work are useful and efficient for OLED device for the enhancement of EL performance, indicating the potential in a wide range of applications, such as displays, lightings and so on. Display omitted •The polyimide/porous silica light extraction films were accomplished by spin coating a hybrid film composed of a polyimide-silica composite blended with various amount of porous silica nanoparticles.•The incorporation of light extraction layer improved the maximum external quantum efficiency (EQE) by as much as 24.8%.•The device utilizing the light extraction layer showed identical EL spectra as the reference device did.
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