Tunable-Color UV-Excitation Sb3+/(Bi3+, Ag+)-Doped Cs2NaInCl6 Perovskite for High-Color-Rendering Full-Spectrum w-LEDs

Traditional white light-emitting diodes (w-LEDs) have a cyan gap between 480 and 520 nm, which leads to the reduction of color vividness. Herein, a new combination strategy is proposed to prepare the full-spectrum w-LEDs: the blue phosphors and broad orange-yellow phosphors originated from Cs2NaInCl6 are blended on an ultraviolet (UV) chip. We obtained the blue phosphors and broadband orange-yellow phosphors by introducing Sb3+ and Ag+/Bi3+, respectively, into Cs2NaInCl6. Cs2NaIn0.97Cl6:0.03Sb3+ and Cs2Na0.9Ag0.1In1–yCl6:yBi3+ (y = 0.03, 0.1, 0.2, 0.6, and 1) were employed for fabricating a series of full-spectrum w-LED devices with a 340 nm UV chip. The obtained white LED (Cs2NaIn0.97Cl6:0.03Sb3++Cs2Na0.9Ag0.1In0.8Cl6:0.2Bi3+) shows a high color rendering index of 93.6 and a low correlation color temperature (CCT = 4986 K). This work provides a new direction for the fabrication of full-spectrum w-LEDs.