Thermometry and up-conversion luminescence of Yb3+-Er3+ co-doped Na(2)Ln(2)Ti(3)O(10) (Ln = Gd, La) phosphors
Thermometry and up-conversion luminescence of Yb3+-Er3+ co-doped Na(2)Ln(2)Ti(3)O(10) (Ln = Gd, La) phosphors
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Yb3-Er3共掺杂Na(2)Ln(2)Ti(3)O(10) (Ln = Gd, La)荧光粉的测温和上转换发光
DOI：
10.1039/c6cp02746f
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发表时间：
2016
影响因子：
3.3
通讯作者：
Li Ting
中科院分区：
文献类型：
--
作者：
Zhang Zhiyu;Guo Chongfeng;Suo Hao;Zhao Xiaoqi;Zhang Niumiao;Li Ting
采用溶胶-凝胶法成功合成了Yb 3 +/Er 3+共掺杂的Na 2Ln 2 Ti 3 O 10（Ln = Gd，La）上转换发光材料，并用粉末X射线衍射对其晶体结构进行了表征。在980 nm近红外（NIR）光的激发下，样品发出耀眼的黄绿色光，分别由Er 3+的2 H 11/2/4 S 3/2 → 4 I 15/2和4 F 9/2 → 4 I 15/2跃迁的绿色和红色发射带组成。根据其UC发射强度确定了最佳组成和合成参数。基于UC机制阐述了光子吸收和发射过程，其中从Yb 3+到Er 3+的能量转移（ET）起着关键作用，并通过Er 3+单掺和Yb 3 +/Er 3+共掺Na 2 Ln 2 Ti 3 O 10样品的绿色发射寿命的变化得到了证明。在290-490 K范围内，计算了2 H_（11/2）→ 4 I_（15/2）（526 nm）和4S_（3/2）→ 4 I_（15/2）（549 nm）两个热耦合能级（TCL）发射随温度变化的荧光强度比（FIR），并且它们的灵敏度值对于Na 2Gd 2 Ti 3 O 10在490 K下约为0.0058 K−1，对于Na 2La 2 Ti 3 O 10在470 K下约为0.0061 K−1，作为潜在的光学温度传感器。
Yb3+/Er3+-ion co-doped Na2Ln2Ti3O10 (Ln = Gd, La) up-conversion (UC) phosphors were successfully synthesized by a sol–gel method, and their crystal structures were characterized by powder X-ray diffraction. Dazzling yellow-greenish light was emitted under the excitation of 980 nm near-infrared (NIR) light, composing green and red emission bands from the 2H11/2/4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3+, respectively. The optimal composition and synthesis parameters were determined according to their UC emission intensity. The photon absorption and emission processes were illustrated based on the UC mechanism, in which energy transfer (ET) from Yb3+ to Er3+ plays a pivotal role and has been proved by the variation of green emission lifetime in Er3+ singly and Yb3+/Er3+ co-doped Na2Ln2Ti3O10 samples. The temperature-dependent fluorescence intensity ratios (FIR) of the two thermal coupled energy level (TCL) emission from 2H11/2 → 4I15/2 (526 nm) and 4S3/2 → 4I15/2 (549 nm) were calculated in the range of 290–490 K, and their sensitivity values were approximately 0.0058 K−1 for Na2Gd2Ti3O10 at 490 K and 0.0061 K−1 for Na2La2Ti3O10 at 470 K, as potential optical temperature sensor.