Title :
Improvement of light extraction efficiency of white LEDs using microstructure array on phosphor silicone layer
Author :
Shan Yu ; Run Hu ; Mingxiang Chen ; Sheng Liu
Author_Institution :
State Key Lab. for Digital Manuf. Equip. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
White light emitting diodes (LEDs) with microstructure array on top surface of the phosphor silicone layer are demonstrated to have enhanced the light extraction efficiency (LEE) compared with white LEDs with flat phosphor layer. The effects of microstructure array on the LEE of LEDs are investigated by ray tracing simulations and experiments. Simulation results reveal that spherical cap microstructure array can increase the LEE by 12%. Experimental results also show that spherical cap microstructure array fabricated by a molding method can increase the luminous efficiency by 10.1%.
Keywords :
crystal microstructure; light emitting diodes; phosphors; ray tracing; silicones; LEE; flat phosphor layer; light extraction efficiency; microstructure array effect; phosphor silicone layer; ray tracing simulations; spherical cap microstructure array; white LED; white light emitting diodes; Absorption; Abstracts; Ceramics; Educational institutions; Light emitting diodes; Packaging; Substrates;
Conference_Titel :
Electronic Packaging Technology and High Density Packaging (ICEPT-HDP), 2012 13th International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4673-1682-8
Electronic_ISBN :
978-1-4673-1680-4
DOI :
10.1109/ICEPT-HDP.2012.6474708
