Title :
Saving Phosphor by 150% and Producing High Color-Rendering Index Candlelight LEDs Containing Composite Photonic Crystals
Author :
Chun-Feng Lai ; Yu-Chun Lee ; Cheng-Ta Kuo
Author_Institution :
Dept. of Photonics, Feng Chia Univ., Taichung, Taiwan
Abstract :
A technique that saved phosphor use by 150% was applied to warm white light-emitting diodes containing composite colloidal photonic crystals (c-CPhCs) to develop an electrical source of candlelight that exhibits a high luminous flux (52 lm) and a high color-rendering index (CRI; 94). This physiologically friendly light source, which was designed to mimic the color temperature of candlelight, provides at least eight-times more luminous flux than traditional candles do. Furthermore, a UV-based adhesive curing method for enhancing the adhesion properties of c-CPhCs was also developed. A novel, inexpensive technology was implemented to produce high-CRI candlelight LEDs for use as a residential light source.
Keywords :
adhesion; colloids; composite materials; curing; light emitting diodes; light sources; optical design techniques; optical fabrication; phosphors; photonic crystals; refractive index; ultraviolet spectra; UV-based adhesive curing method; adhesion property enhancement; color temperature; color-rendering index candlelight LED; composite colloidal photonic crystals; electrical source; light source design; luminous flux; phosphor; white light-emitting diodes; Indexes; Light emitting diodes; Lighting; Phosphors; Photonic crystals; Reflection; Candlelight; UV adhesive; colloidal photonic crystals (CPhCs); light-emitting diodes (LEDs);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2309955
