Luminescence properties and first principles calculations of Dy3+ activated Sr3B2O6 phosphors

Abstract

A novel white-light-emitting Sr 3 B 2 O 6: Dy 3+ phosphor was prepared by solid-state reactions and its luminescence properties were investigated. The excitation spectrum of obtained phosphor monitored at 479 nm covers a very broad spectral region from 320 nm to 460 nm with peaks at 323, 349, 363, 386, 427 and 456 nm. Under excitation at 349 nm, the phosphor exhibits a blue emission centered at 479 nm and a yellow emission centered at 574 nm. The optimal doping concentration of Dy 3+ is obtained to be 7 mol%, and the concentration quenching is observed when the concentration of Dy 3+ exceeds 7 mol%. This concentration quenching is due to the enhanced energy exchange among Dy 3+ ions. The CIE chromaticity coordinate (0.289, 0.302) of Sr 3-0.07 B 2 O 6:0.07 Dy 3+ located in the white-light region can be achieved. Theoretical calculations of electronic properties for Sr 3 B 2 O 6: Dy 3+ phosphor in the framework of the density functional theory (DFT) were carried out. Our results suggest that the Sr 3 B 2 O 6: Dy 3+ phosphor is a promising single-component white-light-emitting material.