锥状微结构阵列提高OLED出光效率的研究
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摘要
为提高OLED出光效率,在OLED基底上设计锥状微结构阵列,通过几何光学和光线追迹方法分析了锥状微结构对OLED出光效率的影响。结果表明:锥状微结构阵列最大可以提高60%的出光效率;锥状微结构阵列的占空比、材料折射率和坡度角对出光效率有较大影响;锥状微结构阵列不会改变OLED的辐射角,且有一定的聚光作用。结果为提高OLED出光效率提供一种新的参考和方法。
A cone-shaped microstructure array was designed on the OLED substrate in order to improve the luminous efficiency of OLED.By means of geometrical optics and ray tracing method,the influence of the surface structure on the luminous efficiency is analyzed.Analysis shows that the maximum luminous efficiency is increased to 60%.Parameters of cone-shaped microstructure array such as duty ratio,the refractive index of the cone microstructure and the slope angle have great effect on the light efficiency.The cone microstructure arrays do not change the radiation angle of OLED,and has concentration function.Results provide a new reference and method for improving the luminous efficiency of OLED.
A cone-shaped microstructure array was designed on the OLED substrate in order to improve the luminous efficiency of OLED.By means of geometrical optics and ray tracing method,the influence of the surface structure on the luminous efficiency is analyzed.Analysis shows that the maximum luminous efficiency is increased to 60%.Parameters of cone-shaped microstructure array such as duty ratio,the refractive index of the cone microstructure and the slope angle have great effect on the light efficiency.The cone microstructure arrays do not change the radiation angle of OLED,and has concentration function.Results provide a new reference and method for improving the luminous efficiency of OLED.
引文
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[2]马东阁.显示与照明---从基础研究到未来的应用[J].液晶与显示,2016,31(3):229-241.MA D G.OLED display and lighting-from basic research to future applications[J].Chinese Journal of Liquid Crystals and Displays,2016,31(3):229-241.(in Chinese)
[3]SCHMIDT T D,SCHOLZ B J,MAYR C,et al.Efficiency analysis of organic light-emitting diodes based on optical simulations[J].IEEE Journal of Selected Topics in Quantum Electronics,2013,19(5):7800412.
[4]陈俊,王青松.基于OLED显示单元的红外上转换器件研究进展[J].中国光学,2015,8(1):17-27.CHEN J,WANG Q S.Recent progress of infrared upconversion device based on the integration of OLED[J].Chinese Optics,2015,8(1):17-27.(in Chinese)
[5]杨洋,陈淑芬,谢军,等.有机发光二极管光取出技术研究进展[J].物理学报,2011,60(4):047809.YANG Y,CHEN S F,XIE J,et al.Comprehensive survey for the frontier disciplines[J].Acta Physica Sinica,2011,60(4):047809.(in Chinese)
[6]LEE Y J,KIM S H,HUH J,et al.A high-extraction-efficiency nanopatterned organic light-emitting diode[J].Applied Physics Letters,2003,82(21):3779-3781.
[7]KIM H K,CHO S H,OH J R,et al.Deep blue,efficient,moderate microcavity organic light-emitting diodes[J].Organic Electronics,2010,11(1):137-145.
[8]KUMAR A,SRIVASTAVA R,TYAGI P,et al.Efficiency enhancement of organic light emitting diode via surface energy transfer between exciton and surface plasmon[J].Organic Electronics,2012,13(1):159-165.
[9]XIAO Y,YANG J P,CHENG P P,et al.Surface plasmon-enhanced electroluminescence in organic lightemitting diodes incorporating Au nanoparticles[J].Applied Physics Letters,2012,100(1):013308.
[10]ZHOU J H,AI N,WANG L,et al.Roughening the white OLED substrate’s surface through sandblasting to improve the external quantum efficiency[J].Organic Electronics,2011,12(4):648-653.
[11]CHEN S M,KWOK H S.Light extraction from organic light-emitting diodes for lighting applications by sandblasting substrates[J].Optics Express,2010,18(1):37-42.
[12]MLADENOVSKI S,NEYTS K,PAVICIC D,et al.Exceptionally efficient organic light emitting devices using high refractive index substrates[J].Optics Express,2009,17(9):7562-7570.
[13]LEE I,PARK J Y,GIM S,et al.Optical enhancement in optoelectronic devices using refractive index grading layers[J].ACS Applied Materials&Interfaces,2016,8(5):3326-3332.
[14]SLOOTSKY M,FORREST S R.Full-wave simulation of enhanced outcoupling of organic light-emitting devices with an embedded low-index grid[J].Applied Physics Letters,2009,94(16):163302.
[15]BAI J J,WU X M,HUA Y L,et al.Efficiency of a blue organic light-emitting diode enhanced by inserting charge control layers into the emission region[J].Chinese Physics B,2013,22(4):047806.
[16]CHEN C P,LI H J,ZHANG Y,et al.Thin-film encapsulation for top-emitting organic light-emitting diode with inverted structure[J].Chinese Optics Letters,2014,12(2):022301.
[17]HYUN W J,IM S H,PARK O O,et al.Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes[J].Organic Electronics,2012,13(4):579-585.
[18]KIM H S,MOON S II,HWANG D E,et al.Novel fabrication method of microlens arrays with High OLED outcoupling efficiency[J].Optics and Laser Technology,2016,77:104-110.
[19]钟可君,高益庆.微透镜阵列在提高OLED取光效率中的应用[J].半导体光电,2014,35(1):1-4.ZHONG K J,GAO Y Q.Applications of microlens arrays for light extraction enhancement in OLED[J].Semiconductor Optoelectronics,2014,35(1):1-4.(in Chinese)
[20]D’ANDRADE B,BROWN J J.Organic light-emitting device luminaire for illumination applications[J].Applied Physics Letters,2006,88(19):192908.