Abstract

Mn⁴⁺-activated oxide phosphors with low cost and unique luminescent properties have been considered as a promising candidate for various optical applications, while the search for high thermal stable red-emitting phosphors is still a huge challenge. In our work, we find and unveil the relationship between luminescence thermal quenching behavior and thermal expansion coefficients (α/10⁻⁶K⁻¹) based on double-perovskite niobate phosphors Ca₂LnNbO₆:Mn⁴⁺ (Ln³⁺= Y³⁺, Gd³⁺, La³⁺, or Lu³⁺). It can be concluded that the phosphors with low thermal expansion coefficients contribute to high thermal stability. Subsequently, Ca₂LuNbO₆:Mn⁴⁺ accomplishes accurate temperature testing and high-CRI white light-emitting diodes. Thus, a thermal expansion coefficient strategy is a new guide to select the appropriate substrate with high thermal stability for an Mn⁴⁺-activated emitter.

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