White-light emission lead-free perovskite phosphor Cs2ZrCl6:Sb3+

Obtaining phosphors with white-light emission is a promising and economical approach for phosphor-conversion light emitting diodes (pc-LEDs), but traditional single-phase white light emission phosphors are inefficient. Here a white-light-emission phosphor was prepared via a co-precipitation method by doping Sb3+ into lead-free and vacancy-ordered double perovskite Cs2ZrCl6. X-ray diffraction, X-ray photoelectron spectroscopy, and formation energy calculations confirmed that Sb3+ ions replaced the Zr4+sites in the [ZrCl6]2− octahedron. The optical properties of Cs2ZrCl6:Sb3+ were investigated and compared with those of blank Cs2ZrCl6. The origination of the emission bands was determined according to their fluorescence spectra and decay-time at an approximate temperature of 4 K Sb3+-doped Cs2ZrCl6 exhibited white-light emission with double emission bands at 495 and 622 nm due to the 1P1 → 1S0 and 3P2, 1, 0 → 1S0 transitions of Sb3+, respectively. The intensity ratios of cyan light (495 nm) and the red light emission bands (622 nm) were tunable by adjusting the Sb3+concentration. The red component increased with increasing Sb3+ concentration in the present experimental range. Moreover, 10% Sb3+-doped Cs2ZrCl6 showed the strongest emission with a photoluminescence quantum yield of approximately 78% under excitation of 333-nm light White LED devices with different correlated color temperatures were achieved by combining 1% or 10% Sb3+-doped Cs2ZrCl6 with a 310-nm ultraviolet chip, suggesting that the synthesized samples have potential applications in white-illumination LEDs.