Mn 4+ activated fluoride phosphors have been considered as highly promising red component for warm white light-emitting diodes in recent years. In this paper, we successfully prepared the K 2 TiF 6 : Mn 4+ red phosphors in H 3 PO 4 /KHF 2 liquid instead of the hypertoxic HF liquid. The impact factors, such as the amount of F source, the reaction temperature, reaction time, and the luminescence mechanism are investigated in detail. We found that K 2 TiF 6 : Mn 4+ shows pure red emission and can be excited by blue lights, which can perfectly match the InGaN chip based white light-emitting diodes. Most importantly, K 2 TiF 6 : Mn 4+ exhibits excellent quenching behavior and shows small color shift in the temperature range of 300-475 K. Our researches could provide a green synthetic strategy to obtain the K 2 TiF 6 : Mn 4+ phosphors and contribute to the optimization of red phosphors for white light-emitting diodes.
In this work, a series of Ce3+ ions activated K2CaP2O7 phosphors were prepared through a solid-state reaction method. The luminescence spectra in the ultraviolet-visible range as well as the decay curves were studied. Ce3+ ions enter one Ca2+ site in the host, the two emission bands are at 347 nm and 369 nm. The five 4f–5d excitation bands and the centroid shift of Ce3+ were determined at low temperature. The critical energy transfer distance and the luminescence thermal quenching properties were also discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.