亚微米尺寸K_(2)SiF_(6)∶Mn^(4+)红色荧光粉的沉淀法合成及其发光性能

Synthesis and Luminescence Properties of Submicron K_(2)SiF_(6)∶Mn^(4+)Red Phosphor by Precipitation Method

亚微米尺寸K_(2)SiF_(6)∶Mn^(4+)荧光粉被认为是Micro-LED显示领域的变革性技术,但是小粒径K_(2)SiF_(6)∶Mn^(4+)荧光粉的合成技术不成熟,难以实现亚微米尺度下的高效发光。因此,本文报道了一种亚微米级K_(2)SiF_(6)∶Mn^(4+)荧光粉的沉淀合成新方法。经荧光光谱分析,该荧光粉在450 nm蓝光激发下展现出典型的Mn^(4+)红色发光,其内量子效率高达94.9%。经扫描电子显微镜(SEM)观察,合成的荧光粉粒径分布在150~450 nm范围。该荧光粉具备良好的热猝灭性能,在443 K可保持室温发光强度的102%。将绿色荧光粉β-sialon∶Eu^(2+)和K_(2)SiF_(6)∶Mn^(4+)混合涂覆在蓝光芯片上制成白光LED,其色域覆盖范围达到133%NTSC,在驱动电流从10 mA增加到120 mA的情况下,色温波动~10%、显色指数波动~2%,总体性能保持稳定。本文将为亚微米尺寸K_(2)SiF_(6)∶Mn^(4+)荧光粉的合成提供新的方法,以促进Micro-LED显示技术的进一步发展。

Sub-micrometer-sized K_(2)SiF_(6)∶Mn^(4+)phosphors hold transformative potential in the Micro-LED display in-dustry.However,the synthesis of small-diameter K_(2)SiF_(6)∶Mn^(4+)phosphors remains a challenge due to immature tech-nology,hindering efficient luminescence at the sub-micrometer scale.This paper introduces a novel method for syn-thesizing sub-micrometer-sized K_(2)SiF_(6)∶Mn^(4+)phosphors via precipitation.Fluorescence spectroscopy analysis reveals that the phosphor displays typical Mn^(4+)red emission under 450 nm blue light excitation,with an internal quantum ef-ficiency reaching 94.9%.SEM observation indicates that the synthesized phosphor particles exhibit a size distribu-tion between 150 nm and 450 nm.The phosphor demonstrates excellent thermal quenching performance,maintain-ing 102% of the initial luminescence intensity at 443 K.A white LED was fabricated by combining green phosphorβ-sialon∶Eu^(2+)and K_(2)SiF_(6)∶Mn^(4+)and applying it to a blue chip.The color gamut coverage achieved 133%NTSC,and the color temperature and color rendering index fluctuated by approximately 10% and 2% respectively when the driv-ing current increased from 10 mA to 120 mA,indicating overall stable performance.This paper offers fresh insights into the synthesis of sub-micrometer-sized K_(2)SiF_(6)∶Mn^(4+)phosphors,contributing to the advancement of Micro-LED display technology.