Preparation and Luminescence Properties of BaClF: Eu³⁺ Orange Fluorescent Materials Doped With Charge Compensator M⁺...

BaClF: Eu³⁺ orange-emitting phosphor was successfully synthesized by a hydrothermal method. The luminescent properties of the material were further enhanced by adding alkali metal ions. XRD analysis confirmed the phase purity and successful synthesis of the BaClF:Eu³⁺, M⁺ phosphor. Under 393-nm excitation, the fluorescence spectrum of the synthesized product exhibited a main emission peak at 593 nm. Experimental results indicate that the quenching concentration of Eu³⁺ ions is 6.0 mol%. To further increase the luminescence intensity, alkali metal ions (Li⁺, Na⁺, and K⁺) were also introduced as charge compensators. The results showed that Li⁺ was identified as the most effective compensator, yielding a 2.11-fold enhancement in emission intensity. The optimal doping concentration of Li⁺ was determined to be 6.0 mol%. The internal quantum efficiency (IQE) was theoretically estimated using Judd-Ofelt parameters, showing a substantial increase upon Li⁺ doping. BaClF: Eu³⁺, Li⁺ phosphor exhibits a color purity as high as 99.6% and a correlated color temperature of 1640.3 K. This indicates that BaClF: Eu³⁺, Li⁺ is a highly promising orange-emitting phosphor and a candidate material for solid-state lighting applications.