Rare Earth (RE) doped color tunable phosphors for white light emitting diodes

Abstract Currently, white light-emitting diodes (WLEDs) are emerging lighting techniques and are highly desirable. These are one of the world’s highest lighting technologies. LEDs have attracted special attention of research society, scholars and society through their benefits and applications. Phosphor-converting light-emitting diodes (PC-LEDs) show immense potential for the future and, in the coming years, it is expected that LEDs will be easily available at a cheaper price with lower energy consumption. Rare earth activated phosphors are an integral and important part of white light generation. In this review, we have studied numerous research papers about phosphor-converted light-emitting diodes (pc-LED). The main objective of this review paper is to analyze inorganic materials that have been synthesized by various methods and are suitable for eco-friendly lighting applications. In this review, we propose the plan and discovery of new LED phosphors from two alternate points of view, i.e., basic crystal structure in various host systems and co-doped activators through energy transfer. The color-tunable properties of rare-earth activated phosphors explain in detail. Numerous color-tunable phosphor materials have been studied and discussed in this review. In addition, utilizations, difficulties and development or improvement of pc-WLEDs will be discussed.