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In this paper, we established a optical model and optimized a double-sided hemispherical patterned sapphire substrate (PSS) for highly efficient flip-chip GaN-based light emitting diodes (LEDs). A simulation is conducted to study how light extraction efficiency changes with the change in the parameters of the unit hemisphere for LEDs fabricated on hemispherical PSS. Results show that the light extraction...
In this paper, we established a optical model and made an analysis of GaN-based LED flip chip by double-sided PSS (patterned sapphire substrate). The result analysis shows that the small distance and large radius of micro-cylinder and micro-hemisphere for cylindrical and hemispherical PSS would be more effective to enhance LED efficacy. The hemispherical pattern is more efficient than the cylindrical...
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