Synthesis and photoluminescence Sr2LaTaO6:Mn4+ phosphors with ultrahigh color purity for good CRI warm-WLED devices

Abstract

Significant effort has been made in the exploration of Mn4+ activated red phosphor as a red component for the fabrication of white light emitting diodes (WLEDs) with superior performance (e.g., low correlated color temperature (CCT), high color render index (CRI)). Herein, the red luminescence of Sr2LaTaO6:Mn4+ phosphor was synthesized via high temperature solid state method. The crystal structure, luminescence behavior, and application in WLEDs of as-prepared phosphor were systematically investigated. The optimal Sr2LaTaO6:0.001Mn4+ phosphor showed a strong red emission with high color purity of 98.7 under the excitation wavelength of 316 nm, which is originated from the 2Eg→4A2 g transition of Mn4+ ion transition. Besides, the concentration quenching and thermal quenching phenomena were analyzed. Finally, by employing the Sr2LaTaO6:0.001Mn4+ phosphor as a red component for the fabrication of WLEDs, warm white lighting with a good CRI (91.45) and a low CCT (3859 K) could be achieved. Those findings suggested that the prepared Sr2LaTaO6: Mn4+ phosphor could be promising as a red component for the construction of good CRI warm-WLED devices