Luminescent properties, energy transfer, and thermal stability of double perovskites La2MgTiO6:Sm3+, Eu3+
Luminescent properties, energy transfer, and thermal stability of double perovskites La2MgTiO6:Sm3+, Eu3+
复制标题
DOI：
10.1016/j.jlumin.2018.08.013
复制
发表时间：
2018-12-01
影响因子：
3.6
通讯作者：
Zhang, Sijing
中科院分区：
文献类型：
--
作者：
Su, Binbin;Xie, Huidong;Zhang, Sijing
采用高温固相法制备了Sm 3+和Eu 3+双掺杂的La 2 MgTiO 6红色荧光粉。采用X射线衍射、扫描电镜、荧光光谱等手段对样品的物相组成、形貌、荧光光谱、荧光寿命和热稳定性进行了分析。La 2 MgTiO 6：Sm 3+，Eu 3+荧光粉的最佳合成温度为1400 ℃。La2MgTiO6：在396 nm激发下，Eu 3+在615 nm处发射红光;在406 nm激发下，La 2 MgTiO 6：Sm 3+在601 nm处发射红橙子光。La 2 MgTiO 6：Sm 3+，Eu 3+荧光粉在406 nm激发下，在615 nm处有较强的红光发射。在La_2MgTiO_6：Sm ~（3+），Eu ~（3+）中，Sm ~（3+）向Eu ~（3+）的能量传递非常有效。当Eu ~（3+）浓度为0.2时，能量转移效率达到最大值73.5%。变温发射光谱表明，该荧光粉具有良好的热稳定性。La1.94MgTiO6：0.06Sm（3+）、La1.85MgTiO6：0.15Eu（3+）和La1.79MgTiO6：0.06Sm（3+），0.15Eu（3+）的色纯度分别为96.26%、98.05%和98.95%。
La2MgTiO6 red phosphors doped with both Sm3+ and Eu3+ were prepared by high temperature solid state method. Their phase compositions, morphologies, fluorescence spectra, fluorescence lifetimes and thermal stability were analyzed by X-ray diffraction, scanning electron microscopy, and fluorescence spectroscopy. The optimal synthetic temperature of La2MgTiO6:Sm3+, Eu3+ phosphors was 1400 degrees C. La2MgTiO6: Eu3+ showed red emission at 615 nm under 396 nm excitation, while La2MgTiO6:Sm3+ showed red orange emission at 601 nm under 406 nm excitation. La2MgTiO6:Sm3+, Eu3+ phosphor showed strong red emission at 615 nm under the excitation of 406 nm. The energy transfer from Sm3+ to Eu3+ in La2MgTiO6:Sm3+, Eu3+ was very effective. The maximum energy transfer efficiency was about 73.5% when Eu3+ concentration was 0.2. The temperature dependent emission spectra showed that the phosphors had good thermal stability. The La1.94MgTiO6:0.06Sm(3+), La1.85MgTiO6:0.15Eu(3+) and La1.79MgTiO6:0.06Sm(3+), 0.15Eu(3+) phosphors exhibited color purities close to 100%: 96.26%, 98.05% and 98.95%.