Abstract
The luminescent material is microcrystalline powders or thin-films designed to provide visible colour emission on excitation by different sources. These are also called phosphors they can be developed in to a potential candidate for applications like Solar cell device, LEDs, Display devices.etc. Present paper is an Review of the phosphors materials for Light emitting devices (LED), their present status and challenges.
Highlights
Phosphors are luminescent materials that emit light when excited by radiation, and are usually microcrystalline powders or thin-films designed to provide visible colour emission
The Inorganic materials like metal sulphates, aluminates, oxides, silicates, if synthesised by special procedures under controlled conditions were found to show luminescence, luminescent efficiency in these materials can be enhanced by adding small amount of impurity called activators
The phosphors used in lightemitting diodes (LEDs) should have overlapping excitation spectra to emission spectra 420490 nm or 360-400 nm for blue, near UV LEDs respectively
Summary
Phosphors are luminescent materials that emit light when excited by radiation, and are usually microcrystalline powders or thin-films designed to provide visible colour emission. Electroluminescence finds applications in panel lighting used in some liquid-crystal display (LCD), in inorganic lightemitting diodes (LEDs) and organic light-emitting diodes (OLEDs). The basic requirement of efficient LEDs are defined to have strong absorption in the near UV/blue region and emission in the visible region. This has induced a world-wide research activity for search of inorganic phosphors with new compositions and doped with transition/rare earth ions and tune the optical properties of these activator ions as to their suitability in LEDs. Http://www.ijetmr.com©International Journal of Engineering Technologies and Management Research [96]. [[Singh *, Vol. (Iss.: SE): February, 2018] [Communication, Integrated Networks & Signal Processing-CINSP 2018]
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