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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 4 — Feb. 15, 2014
  • pp: 762–765

Smart design to resolve spectral overlapping of phosphor-in-glass for high-powered remote-type white light-emitting devices

Jin Seok Lee, P. Arunkumar, Sunghoon Kim, In Jae Lee, Hyungeui Lee, and Won Bin Im  »View Author Affiliations

Optics Letters, Vol. 39, Issue 4, pp. 762-765 (2014)

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The white light-emitting diode (WLED) is a state-of-the-art solid state technology, which has replaced conventional lighting systems due to its reduced energy consumption, its reliability, and long life. However, the WLED presents acute challenges in device engineering, due to its lack of color purity, efficacy, and thermal stability of the lighting devices. The prime cause for inadequacies in color purity and luminous efficiency is the spectral overlapping of red components with yellow/green emissions when generating white light by pumping a blue InGaN chip with yellow YAG:Ce3+ phosphor, where red phosphor is included, to compensate for deficiencies in the red region. An innovative strategy was formulated to resolve this spectral overlapping by alternatively arranging phosphor-in-glass (PiG) through cutting and reassembling the commercial red CaAlSiN3:Eu2+ and green Lu3Al5O12:Ce3+ PiG. PiGs were fabricated using glass frits with a low softening temperature of 600°C, which exhibited excellent thermal stability and high transparency, improving life time even at an operating temperature of 200°C. This strategy overcomes the spectral overlapping issue more efficiently than the randomly mixed and patented stacking design of multiple phosphors for a remote-type WLED. The protocol for the current design of PiG possesses excellent thermal and chemical stability with high luminous efficiency and color purity is an attempt to make smarter solid state lighting for high-powered remote-type white light-emitting devices.

© 2014 Optical Society of America

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4610) Optical design and fabrication : Optical fabrication
(230.0230) Optical devices : Optical devices

ToC Category:
Optical Design and Fabrication

Original Manuscript: October 15, 2013
Revised Manuscript: December 7, 2013
Manuscript Accepted: December 9, 2013
Published: February 4, 2014

Virtual Issues
Vol. 9, Iss. 4 Virtual Journal for Biomedical Optics

Jin Seok Lee, P. Arunkumar, Sunghoon Kim, In Jae Lee, Hyungeui Lee, and Won Bin Im, "Smart design to resolve spectral overlapping of phosphor-in-glass for high-powered remote-type white light-emitting devices," Opt. Lett. 39, 762-765 (2014)

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