The photoluminescence and Judd-Ofelt investigations of UV, near-UV and blue excited highly pure red emitting BaWO4: Eu3+ phosphor for solid state lighting

Development of SrWO4:Ho3+/Yb3+ green phosphor for optical thermometry application

“…Direct band gap semiconductors having low phonon energy and high absorption efficiency, and dedicated to transferring the absorbed energy to the embedded activator ions are ideal as host materials. 6,7 The commonly used inorganic host materials are oxide, tungstate, molybdate, phosphate, silicate, borate and fluoride based. 7,8 Among these, tungstate based host materials of the form AWO 4 like CaWO 4 , SeWO 4 and BaWO 4 are often preferred because of their high thermal and chemical stability, low phonon energy (919 cm −1 ), efficient energy transfer ability to the activator ions and strong charge transfer absorption band in the UV region.…”

“…Rare earth ions are known for their high luminous efficacy and sharp emission band, and for providing freedom to generate light of different colors by selecting different rare earth ions. 6,12…”