Abstract
Phosphor-converted LEDs (pc-LEDs) have been employed for solid-state lighting applications. The use of phosphor helped in achieving desirable properties such as good color rendition (CRI), coordinated color temperature (CCT), etc. White LED lamps have been fabricated using downshifting phosphors. However, few efforts have been made to develop ultraviolet (UV) emitting LEDs using downshifting phosphors. On the other hand, numerous reports are available in the literature on directly UV emitting LED. Such LEDs are available commercially. Cost and efficiencies of directly UV emitting LED chips vary. It could be useful to coat suitable phosphors of low cost, excitable by shorter wavelengths on UV emitting chips to obtain pc-LED emitting at longer wavelength UV region. This concept is demonstrated here by using suitable phosphors and a chip emitting at 275 nm to obtain pc-UVLED emitting in 300–340 nm range.
Published Version
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