Enhancing light extraction from tapered internal reflection microstructure |
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| Authors: | Xufeng Jing Ying Tian Pei Liang Le Wang Qianmin Dong Shangzhong Jin |
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| Institution: | 1. Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China;2. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China |
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| Abstract: | The internal transmittance characteristics of the taper surface microstructure grating with the feature size in a large dimension range from subwavelength nanostructure to microstructure are investigated to improve the light extraction efficiency of light emitting diodes. It is found that subwavelength taper nanostructure can not overcome the total internal reflection, but it is interesting that the taper microstructure can effectively surmount the total internal reflection at a larger emitted angle over the critical angle also with higher transmittance. Besides, the emission characteristics of light intensity for subwavelength nano-grating and taper micro-grating are demonstrated. Also, the simple approaches of the scalar diffraction theory and the effective medium method can accurately analyze respectively the taper microstructure and subwavelength nanostructure grating. It is expected that the taper microstructure could be integrated into light emitting diodes to tremendously enhance the emission efficiency. |
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