ELiXIR-Solid-State Luminaire With Enhanced Light Extraction by Internal Reflection

Author

Allen, Steven C. ; Steckl, Andrew J.

Author_Institution

Nanoelectronics Lab., Cincinnati Univ., OH

Volume

3

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

155

Lastpage

159

Abstract

A phosphor-converted light-emitting diode (pcLED) luminaire featuring enhanced light extraction by internal reflection (ELiXIR) with efficacy of 60 lm/W producing 18 lumens of yellowish green light at 100 mA is presented. The luminaire consists of a commercial blue high power LED, a polymer hemispherical shell lens with interior phosphor coating, and planar aluminized reflector. High extraction efficiency of the phosphor-converted light is achieved by separating the phosphor from the LED and using internal reflection to steer the light away from lossy reflectors and the LED package and out of the device. At 10 and 500mA, the luminaire produces 2.1 and 66 lumens with efficacies of 80 and 37 lm/W, respectively. Technological improvements over existing commercial LEDs, such as more efficient pcLED packages or, alternatively, higher efficiency green or yellow for color mixing, will be essential to achieving 150-200 lm/W solid-state lighting. Advances in both areas are demonstrated

Keywords

LED lamps; lighting; phosphors; 10 mA; 100 mA; 500 mA; ELiXIR; LED luminaire; blue high power LED; enhanced light extraction; internal reflection; phosphor-converted light-emitting diode; planar aluminized reflector; polymer hemispherical shell lens; solid-state lighting; solid-state luminaire; yellowish green light; Light emitting diodes; Optical reflection; Optical wavelength conversion; Organic light emitting diodes; Packaging; Phosphors; Polymer films; Solid state lighting; US Department of Energy; Wavelength conversion; Efficiency; green light-emitting diode (LED); package efficiency; phosphor-converted LED (pcLED); solid-state lighting (SSL);

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2007.895358

Filename

4211182