Charge compensation and solid-state lighting application for dysprosium-activated Ba2TeP2O9 phosphor

In this study, trivalent dysprosium (Dy3+) activators were doped into barium tellurooxyphosphate Ba2TeP2O9 (BTP) by a solid-state sintering procedure, where alkali metal (A = Li, Na, and K) ions co-doped as charge compensator were aimed at improving the luminescent performance. To investigate optical absorption behavior, the electronic structure of the BTP host was realized via the density functional theory (DFT) method. The BTP:Dy3+ phosphor excited by 349 nm shows bright yellow emission. When the concentration of the Dy3+ activator is greater than 0.03 mol, concentration quenching occurs owing to dipole-dipole interaction. After doping 0.03 mol A+ ions into the BTP:0.03Dy3+ phosphor, the emission intensity of BTP:0.03Dy3(+)enhances by 1.18 (Li+), 1.43 (Na+), and 2.32 times (K+). Additionally, the BTP:0.03Dy3+,0.03 K+ phosphor exhibits satisfactory thermal stability. A white light-emitting diode (w-LED) was successfully fabricated from the BTP:0.03Dy3+,0.03 K+ and commercial blue phosphors with a 365 nm LED chip. The study reveals that the BTP:0.03Dy3+,0.03 K+ phosphor is a prospective yellow-emitting candidate for w-LED.(C) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, dysprosium activators were doped into barium tellurooxyphosphate to improve luminescent performance, and alkali metal ions were used as charge compensators. The optical absorption behavior and enhanced emission intensity of the phosphor were investigated. The study reveals that the doped phosphor shows promise as a yellow-emitting candidate for white light-emitting diodes.