Fe²⁺对锰激活氟化物红色荧光粉耐湿性能的影响研究.

Study on the influence of Fe2+ on the moisture resistance of manganese activated fluoride red phosphor.

This paper presents a green and simple redox strategy based on Fe2+, which is used for improving the moisture resistance of fluoride red phosphors. Fluorescent material K2SiF6:Mn4+ were synthesized by coprecipitation method, and the corresponding morphology, crystal component, elemental composition, photoluminescence properties, fluorescence lifetime, water resistance and thermal stability of samples before and after Fe2+ treatment were investigated. The scan electron microscope (SEM) test predicted that after Fe2+ ion treatment, the aggregation of K2SiF6:Mn4+ (T-KSFM) particles was effectively inhibited. The X-ray photoelectron spectroscopy (XPS) indicated that the diminution of Mn was evident on T-KSFM's particle surface after treatment. Spectral test results show that the strongest excitation peak was at about 468 nm, the second strongest peak was at about 360 nm, and the strongest narrowband emission peak was at 632 nm. After the Fe2+ treatment, T-KSFM phosphor was soaked in deionized water for 320 min. Its relative luminescence intensity was 80.3% of the initial luminescence intensity, while that of KSFM was only 63.4%. In addition, the color coordinates of WLEDs made by packaging T-KSFM as the red component, yellow powder YAG and blue chip packaging were (0.4110, 0.3963), which were in the warm white light region. The above results show that this simple redox strategy based on Fe2+ can improve the moisture resistance of fluoride red phosphors effectively, which provided novel ideas to obtaining fluoride phosphors that possess excellent moisture resistance. [ABSTRACT FROM AUTHOR]

提出了一种绿色、简便的基于Fe2+离子的氧化还原策略来提高锰激活氟化物红色荧光粉的耐湿性。采用共沉淀法合成了K2SiF6:Mn4+(KSFM)荧光材料,并对Fe2+处理前后样品的形貌、晶体成分、元素组成、发光性能、荧光寿命、耐湿性和热稳定性进行了研究。SEM结果表明,经Fe2+离子处理后的K2SiF6:Mn4+(T-KSFM)颗粒的团聚程度得到有效的降低。XPS测试结果表明,T-KSFM样品表面Mn含量减少。光谱测试结果表明,最强激发峰约468 nm处,次强峰位于约360 nm处,而最强窄带发射峰位于632 nm处。经过Fe2+处理后的T-KSFM荧光粉在去离子水浸泡320 min后,其相对发光强度为初始发光强度的80.3%,而KSFM仅还有63.4%。此外,将T-KSFM作为红色组分与黄粉YAG以及蓝光芯片封装制得WLEDs色坐标为(0.4110,0.3963),处于暖白光区域。以上结果表明,基于Fe2+的简易氧化还原策略可以有效提高氟化物红色荧光粉的耐湿性,为获得优异耐湿性能的氟化物荧光粉提供了新的思路. [ABSTRACT FROM AUTHOR]