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

fYear

2012

fDate

13-16 Aug. 2012

Firstpage

674

Lastpage

677

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICEPT-HDP.2012.6474708

Filename

6474708