STUDY OF K2SiF6:Mn4+@SiO2 PHOSPHOR FOR WHITE LEDS WITH HIGH ANGULAR COLOR UNIFORMITY

Abstract

The distinctive wide-band blue illumination absorption and red strait-line discharge of the phosphor K₂SiF₆:Mn⁴⁺ (KMnSF) make it an attractive material for manufacturing warm white light-emitting diodes (WLED). Nevertheless, using the highly corrosive raw ingredient HF to produce commercial KMnSF red phosphor has negative effects on the environment and people. In this study, microfluidic technology was used to successfully manufacture the KMnSF without the need for HF compound while resulting in a phosphor product with homogenous granule shape and size. The luminescence capabilities of the KMnSF samples were then thoroughly examined and characterized. Eventually, we made WLED packages comprising of blue LED chips, yellow phosphor Y₃Al₅O₁₂:Ce³⁺ (YGA:Ce), red phosphor KMnSF, and SiO₂ scattering particle. Via varying the SiO₂ concentration during the simulation process, the prepared WLED’s optical performances are obtained. The scattering properties of the phosphor layer as well as the lighting transmission and distribution were simulated with the utilization of both LightTools software and Monte Carlo theory. According to the outcomes, the microfluidic-synthesized K₂SiF₆:Mn⁴⁺ proves to be appropriate for WLED apparatuses. Besides, the proposed phosphor compound with SiO₂ scattering particles showed the improvement in luminous flux and angular uniformity of the WLED.