Luminescence characteristics and crystallographic sites of Ce3+ in LiBaBO3

LiBaBO3:Ce3+ phosphor was prepared by solid-state method, and its luminescence characteristics were investigated. LiBaBO3:Ce3+ phosphor shows one asymmetrical band at 440 nm. Monitored at 440 nm, the excitation spectrum has a broad band at 370 nm. The crystallographic sites of Ce3+ in LiBaBO3 were calculated by van Uitert formula, the results show that the emission band centered at 438 nm originates from the Ce3+ center of the nine compounds, and at 469 nm originates from the Ce3+ center of the eight compounds. The effect of Ce3+ concentration on luminescent intensity of LiBaBO3:Ce3+ phosphor was investigated, the result shows that the luminescent intensity firstly increases with increasing Ce3+ concentration, and reaches the maximal value at 3mol% Ce3+, then decreases. The concentration quenching mechanism is the dipole-dipole interaction by Dexter theory. Under the condition of doping charge compensator Li+, Na+ or K+ the emission intensity of LiBaBO3:Ce3+ was all heightened. The relative emission spectrum of the InGaN-based LiBaBO3:Ce3+ light emitting diode(LED) was investigated, and the CIE chromaticity of InGaN-based LiBaBO3:Ce3+ LED is (x = 0.291, y = 0. 297), and shows the blue white emission.