化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (9) : 128-132. DOI: 10.19817/j.cnki.issn 1006-3536.2020.09.027

新材料与新技术

K₂SiF₆∶Mn⁴⁺,Ti⁴⁺红色荧光粉的合成及发光性能研究

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^1,2*

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Sythesis and luminesence property of K₂SiF₆∶Mn⁴⁺,Ti⁴⁺ red phosphor

Mo Fuwang^1,2, Chen Qiujuan^1,2, Yang Xingling², Hu Lijun², Wei Xiaoxian²

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Received		Published
2019-04-22		2020-09-20
Issue Date	Revised Date
2020-10-20	2019-04-22

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摘要

通过离子交换一步法合成了K₂SiF₆:xMn⁴⁺,yTi⁴⁺系列红色荧光粉,研究了Mn⁴⁺、Ti⁴⁺掺杂量对荧光粉结构及发光性能的影响。采用X射线衍射仪表征了荧光粉的晶体结构,发现少量Mn⁴⁺、Ti⁴⁺掺杂对荧光粉的空间结构未产生显著的影响,制备的红色荧光粉呈立方体面心结构。荧光光谱分析表明,位于353nm和455nm处的激发峰分别属于Mn⁴⁺(3d³)的 ⁴A₂→⁴T₁和 ⁴A₂→⁴T₂的电子跃迁。以波长455nm的蓝光作为激发光源,Mn⁴⁺掺杂量为1%(摩尔分数)的K₂SiF₆:1% Mn⁴⁺荧光粉在580～750nm范围内出现3个尖峰,分别位于616nm、634nm、650nm处,对应于Mn⁴⁺的 ²Eg→⁴A₂跃迁,Ti⁴⁺的掺杂使得荧光粉在634nm处的发射强度提高了7倍左右。当温度上升至420K时,K₂SiF₆:1% Mn⁴⁺荧光粉在634nm处的发射强度仅仅降至室温时的65.8%,表现出优良的热稳定性。

Abstract

K₂SiF₆:Mn⁴⁺ red phosphors co-doped with Ti⁴⁺ were synthesized using ion exchange method.X-ray power diffraction,temperature-dependent luminescence,and photoluminescence analysis were used for characterizing the phosphors.The phosphors doped with various concentrations of Mn⁴⁺ and Ti⁴⁺ had identical well-formed face center cubic of K₂SiF₆.For phosphors of K₂SiF₆:1% Mn⁴⁺,excitation peaks located at 353nm and 455nm correspond to electron transition of ⁴A₂→⁴T₁ and ⁴A₂→⁴T₂,respectively.The peaks showed in the emission spectra(616nm,634nm,650nm) belong to the ²Eg→⁴A₂ transition of Mn⁴⁺.Otherwise,the doping of Ti⁴⁺ in phosphors resulted in the maximum luminous intensity of phosphors at peak of 634nm increasing by about 7 times,comparing to the K₂SiF₆:1% Mn⁴⁺ phosphors.At the temperature of 420K,the emission intensity of K₂SiF₆:1% Mn⁴⁺ fell to 65.8% compared to that at room temperature,showing good thermal stability.

关键词

荧光粉 / 晶体结构 / 发光性质 / 热稳定性

Key words

phosphor / crystal structure / luminescence property / thermal stability

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K₂SiF₆∶Mn⁴⁺,Ti⁴⁺红色荧光粉的合成及发光性能研究[J]. 化工新型材料, 2020, 48(9): 128-132 DOI:10.19817/j.cnki.issn 1006-3536.2020.09.027

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