Compositionally Tuned Self-Activated Alkali Metal Vanadates for High Color Rendering White LEDs and IR Reflective Pigments.

Phosphor-converted white light-emitting diodes (pc-WLEDs) with a supreme color rendering index (CRI) remain challenging, particularly due to the limited accessibility of efficient cyan-green-emitting phosphors in the 480-520 nm emission range. Herein, a novel rare earth-free cyan-green-emitting Ta-substituted CsVO phosphor that exhibits a VO charge transfer enabled cyan-green emission band centered at ∼520 nm under the 370 nm near UV (n-UV) light is reported with an internal quantum efficiency of 93.9%.