Eu³⁺ -activated red phosphor Ca₃ YAl₃ B₄ O₁₅ with low thermal quenching behaviour

This paper reports a sequence of a Ca₃ YAl₃ B₄ O₁₅ :xEu³⁺ red phosphor prepared using a high-temperature solid-state reaction. At the excitation of 396 nm, the samples emitted intense red emission centred at ~623 nm, which could be attributed to the ⁵ D₀ →⁷ F₂ transition of the Eu³⁺ ion. The results showed that the optimum Eu³⁺ doping concentration of Ca₃ YAl₃ B₄ O₁₅ :Eu³⁺ phosphor was x = 80 mol%, and the concentration quenching mechanism of Ca₃ YAl₃ B₄ O₁₅ :Eu³⁺ red phosphor belonged to the exchange coupling between Eu³⁺ ions. The Commission Internationale de l'éclairage (CIE) coordinates and colour purity of Ca₃ Y_0.2 Al₃ B₄ O₁₅ :0.8Eu³⁺ were calculated as (0.6375, 0.3476) and 95.5%, respectively. Moreover, the red emission of the obtained phosphor Ca₃ YAl₃ B₄ O₁₅ :0.8Eu³⁺ exhibited a low thermal quenching behaviour with an intensity retention rate of 92.85% at 150°C. The above results manifest that the Eu³⁺ -activated Ca₃ YAl₃ B₄ O₁₅ phosphor is predicted to be a promising red luminescent component for white light-emitting diodes.