Information and Communication Engineering, Noakhali Science and Technology University, Noakhali, Chittagong, Bangladesh.
Department of Computer Science and Engineering, Kyung Hee University, Yongin-si, Republic of Korea.
PLoS One. 2022 May 27;17(5):e0269134. doi: 10.1371/journal.pone.0269134. eCollection 2022.
This paper proposes a unique method to improve light intensity and efficiency of white organic light emitting diodes (OLEDs) by engraving micro lens arrays (MLAs) on the outer face of the substrate layer. The addition of MLAs on the substrate layer improves the light intensity and external quantum efficiency (EQE) of the OLEDs. The basic OLED model achieved an EQE of 14.45% for the effective refractive index (ERI) of 1.86. The spherical and elliptical (planoconvex and planoconcave) MLAs were incorporated on the outer face of the substrate layer to increase the EQE of the OLEDs. The maximum EQE of 17.30% was obtained for Convex-1 (elliptical planoconvex) MLA engraved OLED where the ERI was 1.70. In addition, Convex-1 MLA engraved OLED showed an improvement of 3.8 times on the peak electroluminescence (EL) light intensity compared to basic OLED. Therefore, Convex-1 MLA incorporated OLED can be considered as a potential white OLED because of its excellent light distribution and intensity profile.
本文提出了一种独特的方法,通过在基板层的外表面刻蚀微透镜阵列(MLA)来提高白色有机发光二极管(OLED)的光强和效率。在基板层上添加 MLAs 可以提高 OLED 的光强和外量子效率(EQE)。基本 OLED 模型在有效折射率(ERI)为 1.86 时达到了 14.45%的 EQE。在基板层的外表面上引入了球形和椭圆形(平凸和平凹)MLA,以提高 OLED 的 EQE。在 ERI 为 1.70 的情况下,Convex-1(椭圆平凸)MLA 刻蚀 OLED 获得了 17.30%的最大 EQE。此外,与基本 OLED 相比,Convex-1 MLA 刻蚀 OLED 的峰值电致发光(EL)光强提高了 3.8 倍。因此,由于其出色的配光和强度分布,Convex-1 MLA 结合的 OLED 可以被视为一种潜在的白色 OLED。