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.

© 2014 IEEE

Candlelight LEDs fabricated by using composite silica photonic crystals

Chun-Feng Lai, Yu-Chun Lee, and Tzong-Liang Tsai
Opt. Mater. Express 5(2) 307-313 (2015)

Light-spectrum modification of warm white-light-emitting diodes with 3D colloidal photonic crystals to approximate candlelight

Chun-Feng Lai, Cheng-Liang Hsieh, and Chia-Jung Wu
Opt. Lett. 38(18) 3612-3615 (2013)

CCT- and CRI-tuning of white light-emitting diodes using three-dimensional non-close-packed colloidal photonic crystals with photonic stop-bands

Chun-Feng Lai, Chung-Chieh Chang, Ming-Jye Wang, and Mau-Kuen Wu
Opt. Express 21(S4) A687-A694 (2013)

Chromaticity tailorable glass-based phosphor-converted white light-emitting diodes with high color rendering index

Li-Yin Chen, Jin-Kai Chang, Wei-Chih Cheng, Jhih-Ci Huang, Yi-Chung Huang, and Wood-Hi Cheng
Opt. Express 23(15) A1024-A1029 (2015)

Optimal spectra of the phosphor-coated white LEDs with excellent color rendering property and high luminous efficacy of radiation

Guoxing He and Huafeng Yan
Opt. Express 19(3) 2519-2529 (2011)