Tunable NIR Emission of Cr3+-Activated Double-Perovskite Tantalates and Improvement of Luminescence Properties via Codoping Yb3+

phosphor with an epoxy adhesive and coating on a 460 nm blue LED chip, an NIR pc-LED device was successfully fabricated, and its prospective usage in nondestructive testing and night vision fields was evaluated. This work contributes to the exploration of blue light effectively stimulating broad-band NIR-emitting phosphors.