Brightness Control of Mn4+-Doped Ca2LaTaO6 Double Perovskite Red Emitters in a Noncontact Circuit System

Graphical This study reports the synthesis of Ca 2 La(Ta,Mn)O 6 double perovskite red emitters, exhibiting strong red emission at 691 nm, with excellent thermal stability and UV excitation. A wireless power transfer system demonstrates adjustable luminescence under various voltages and frequencies, positioning this material as a promising candidate for indoor lighting and noncontact circuits. The rapid adoption of light emitting diodes technology stems from its high efficiency, long lifespan, and energy-saving capabilities. However, achieving high-quality white light emitting diodes, particularly through the integration of efficient red emitters, remains a significant challenge. This study reports the synthesis of Ca₂La(Ta,Mn)O₆ double perovskite red emitters via high-temperature solid-state reactions. The material exhibits a strong red emission peak at 691 nm, attributed to Mn⁴⁺ ions at symmetrical [TaO₆]⁷⁻ octahedral sites, confirmed by g = 2.008 in electron paramagnetic resonance spectroscopy. The UV excitation spectrum (250–600 nm) and thermal stability were analyzed, showing a retained optical intensity of 41% at 423 K. Additionally, a red emitter was developed, and a noncontact LCC-S wireless power transfer driving system was constructed. The system demonstrated adjustable luminescence under varying input voltages (4–7.3 V) and frequencies (90–110 kHz), highlighting its potential for dynamic lighting applications. These findings suggest Ca 2 La(Ta,Mn)O 6 double perovskite as a promising candidate for indoor lighting and noncontact circuit systems.