K2SiF6:Mn4 的( )自旋禁阻跃迁使发射光谱在红光区产生窄带的红光发射。 A. 4A2g→4T1g B4A2g→4T1g B. 2Eg→4A2g C. 2E
K2SiF6:Mn4+的( )自旋禁阻跃迁使发射光谱在红光区产生窄带的红光发射。A.2Eg→4A2gB.4A2g→4T1gC.2Eg→4T1gD.4A2g→4T2g
K2SiF6:Mn4+@K2SiF6 phosphor with remarkable negative thermal quenching and high water resistance for warm white LEDsPhotoluminescenceWater resistanceThermal stabilityPotassium fluorosilicateRed emitting phosphorNegative thermal quenchingPoor water resistance and luminescent thermal stability remain great challenges...
本发明公开一种K2SiF6:Mn4+纳米荧光粉体的制备方法,属于LED荧光粉技术领域,包括以下步骤:将正硅酸四乙酯溶解于乙醇中得到A溶液;将KF溶解于乙酸中得到B溶液;将B溶液滴加至A溶液中,充分搅拌后陈化一段时间。清洗干燥后得到K2SiF6基体。然后将K2MnF6溶解于氢氟酸与硫酸的混合溶液中,将制备的K2SiF6基体放入其中,...
K2SiF6:Mn4+ single crystal phosphors are grown by a facile saturated crystallization method, with the simultaneous fulfillment of high external quantum efficiency (EQE = 78.2%), excellent moisture and thermal resistance, and effective heat dissipation. This work strengthens the competitiveness of ...
摘要:研究了白光ＬＥＤ用Ｋ２ＳｉＦ６ʒＭｎ４＋红色荧光粉湿热环境下的发光性能劣化规律及机理ꎮ结果表明ꎬ环境中水汽的侵蚀可导致Ｋ２ＳｉＦ６ʒＭｎ４＋荧光粉发光性能劣化ꎬ且温度升高可加剧该劣化过程ꎮ８５％湿度/７０ħ下处理６ｈꎬＫ２ＳｉＦ６ʒ７％Ｍｎ４＋荧光粉相对亮度降至初始值的２５...
摘要:采用高效离子交换法制备K2SiF6:Mn^4+荧光粉,研究不同K/Mn原料摩尔比和不同反应时间对K2SiF6:Mn^4+荧光粉结构及性能的影响,并采用溶胶-凝胶法对制备的K2SiF6:Mn^4+荧光粉表面包覆SiO2来提高K2SiF6:Mn^4+荧光粉的热稳定性。通过XRD,SEM,EDS,PL等方法对样品结构、表面形貌、元素组成和发光性能进行测试...
It was found that aqueous environments during the synthesis of the K2MnF6 precursor [4] or the K2SiF6:Mn4+ phosphor can lead to hydrated, Mn3+-containing impurity compounds such as K2MnF5•H2O or KMnF4•H2O. Hydrolysis and hydration processes cause water to be incorporated in the ...
没有改变K2SiF6:Mn^4+的晶格结构,样品具有立方晶系结构.通过荧光光谱图发现当K/Mn摩尔比为43/38在反应8h合成的样品激发峰和发射峰强度最强,激发峰一般由^460nm(^4 A2→^4 T2)强峰和^360nm(^4 A2→^4 T1)次强峰组成,有时会伴有一些弱峰,在460nm的激发下,最强窄带发射峰位于630nm处(^2Eg→^4 A2)...
Synthesis of Narrow-Band Red-Emitting K2SiF6:Mn4+ Phosphors for a Deep Red Monochromatic LED and Ultrahigh color Quality Warm-White LEDs. J. Mater. Chem. C 2015, 3, 607-615.Oh, J.H.; Kang, H.; Eo, Y.J.; Park, H.K.; Do, Y.R. Synthesis of narrow-band red-emitting K2SiF6...