Emission enhancement of Eu3+ doped Ba2Zn(BO3)2 by adding charge compensators

Abstract

Ba2Zn(BO3)2: xEu3+ (0.001≤x ≤ 0.30), Ba2Zn(BO3)2: 0.15Eu3+, 0.05R+ (RLi, Na, K) and Ba2Zn(BO3)2: 0.15Eu3+, yK+ (0≤y ≤ 0.07) phosphors were prepared by high-temperature solid-phase method. The structure, photoluminescence (PL) and other characteristics of the prepared phosphors were studied by X-ray diffraction, ultraviolet–visible spectroscopy, PL spectroscopy and fluorescence lifetime. The concentration quenching mechanism of Eu3+ emission in Ba2Zn(BO3)2 host was investigated. In order to improve the PL performance of Ba2Zn(BO3)2: 0.15 Eu3+ phosphor, the effect of Li+, Na+ and K+ compensators on the PL performance of Ba2Zn(BO3)2: 0.15 Eu3+ luminescent powder was studied. Under excitation at 393 nm, a strong red emission peak is observed at 620 nm. This peak corresponds to the 5D0→7F2 transition and significantly increases its strength by adding a charge compensator. Therefore, the addition of K+ is very effective in improving the PL performance of Ba2Zn(BO3)2: 0.15 Eu3+ phosphors.