White LEDs with limit luminous efficacy

V. M. Lisitsyn, V. S. Lukash, S. A. Stepanov, Ju Yangyang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

In most promising widespread gallium nitride based LEDs emission is generated in the blue spectral region with a maximum at about 450nm which is converted to visible light with the desired spectrum by means of phosphor. The thermal energy in the conversion is determined by the difference in the energies of excitation and emission quanta and the phosphor quantum yield. Heat losses manifest themselves as decrease in the luminous efficacy. LED heating significantly reduces its efficiency and life. In addition, while heating, the emission generation output and the efficiency of the emission conversion decrease. Therefore, the reduction of the energy losses caused by heating is crucial for LED development. In this paper, heat losses in phosphor-converted LEDs (hereinafter chips) during spectrum conversion are estimated. The limit values of the luminous efficacy for white LEDs are evaluated.

Original languageEnglish
Title of host publicationAdvanced Materials in Technology and Construction, AMTC 2015: Proceedings of the II All-Russian Scientific Conference of Young Scientists "Advanced Materials in Technology and Construction"
Subtitle of host publicationProceedings of the II All-Russian Scientific Conference of Young Scientists "Advanced Materials in Technology and Construction"
PublisherAmerican Institute of Physics Inc.
Volume1698
ISBN (Electronic)9780735413450
DOIs
Publication statusPublished - 15 Jan 2016
Event2nd All-Russian Scientific Conference of Young Scientists on Advanced Materials in Technology and Construction, AMTC 2015 - Tomsk, Russian Federation
Duration: 6 Oct 20159 Oct 2015

Conference

Conference2nd All-Russian Scientific Conference of Young Scientists on Advanced Materials in Technology and Construction, AMTC 2015
CountryRussian Federation
CityTomsk
Period6.10.159.10.15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Lisitsyn, V. M., Lukash, V. S., Stepanov, S. A., & Yangyang, J. (2016). White LEDs with limit luminous efficacy. In Advanced Materials in Technology and Construction, AMTC 2015: Proceedings of the II All-Russian Scientific Conference of Young Scientists "Advanced Materials in Technology and Construction": Proceedings of the II All-Russian Scientific Conference of Young Scientists "Advanced Materials in Technology and Construction" (Vol. 1698). [060008] American Institute of Physics Inc.. https://doi.org/10.1063/1.4937863