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Wide range color tunability and efficient energy transfer of novel NaCaGd(WO4)3:Tb3+,Eu3+ phosphors with excellent thermal stability for pc-WLEDs
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-11 , DOI: 10.1039/d1qi00831e Jihuan Xie 1 , Liqun Cheng 2 , He Tang 1 , Zhongxue Wang 1 , Haiying Sun 1 , Liping Lu 1 , Xiaoyun Mi 1 , Quansheng Liu 1 , Xiyan Zhang 1
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2021-08-11 , DOI: 10.1039/d1qi00831e Jihuan Xie 1 , Liqun Cheng 2 , He Tang 1 , Zhongxue Wang 1 , Haiying Sun 1 , Liping Lu 1 , Xiaoyun Mi 1 , Quansheng Liu 1 , Xiyan Zhang 1
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A sequence of NaCaGd(WO4)3:Tb3+,Eu3+ phosphors were prepared via a high temperature solid state reaction method. XRD, Rietveld refinement and SEM were carried out to identify the crystalline phase and morphology. The photoluminescence properties of as-synthesized phosphors excited by ultraviolet light were studied in detail. According to the photoluminescence emission spectra and fluorescence decay curves, efficient energy transfer occurred in these Tb3+, Eu3+ co-doped NaCaGd(WO4)3 phosphors. The energy transfer efficiency reached up to 92.267% when the doping concentration of Eu3+ ions reached 0.4 mol, and the dominant energy transfer mechanism was determined to be the dipole–dipole interaction. The color tunability can be realized from green to red by adjusting the Tb3+/Eu3+ doping ratio. Moreover, the representative NaCaGd(WO4)3:0.6Tb3+,0.1Eu3+ sample exhibited excellent thermal stability, and their emission intensity at 423 K still maintains about 84.7% of that at an initial temperature of 303 K. Ultimately, the as-packaged white LED device exhibited an outstanding correlated color temperature (CCT) of 4505 K and a color rendering index (Ra) of 87.3. The results mentioned above show that all the obtained phosphors are promising candidates in the fields of display devices and pc-WLEDs.
中文翻译：
具有优异热稳定性的新型 NaCaGd(WO4)3:Tb3+,Eu3+ 荧光粉的宽范围颜色可调性和高效能量转移，适用于 pc-WLED
通过高温固相反应方法制备了一系列NaCaGd(WO 4 ) 3 :Tb 3+ ,Eu 3+荧光粉。进行 XRD、Rietveld 精修和 SEM 以鉴定结晶相和形态。详细研究了由紫外光激发的合成磷光体的光致发光特性。根据光致发光发射光谱和荧光衰减曲线，这些Tb 3+、Eu 3+共掺杂NaCaGd(WO 4 ) 3荧光粉发生了有效的能量转移。当Eu 3+的掺杂浓度达到92.267%离子达到 0.4 mol，主要的能量转移机制被确定为偶极-偶极相互作用。通过调整Tb 3+ /Eu 3+掺杂比，可以实现从绿色到红色的颜色可调性。此外，代表性的 NaCaGd(WO 4 ) 3 :0.6Tb 3+ ,0.1Eu 3+样品表现出优异的热稳定性，其在 423 K 时的发射强度仍保持初始温度 303 K 时的约 84.7%。最终，封装好的白光 LED 器件表现出出色的 4505 K 相关色温 (CCT) 和显色指数 ( R a) 的 87.3。上述结果表明，所有获得的荧光粉在显示器件和 pc-WLED 领域都是很有前途的候选者。
更新日期：2021-09-01
中文翻译：
具有优异热稳定性的新型 NaCaGd(WO4)3:Tb3+,Eu3+ 荧光粉的宽范围颜色可调性和高效能量转移，适用于 pc-WLED
通过高温固相反应方法制备了一系列NaCaGd(WO 4 ) 3 :Tb 3+ ,Eu 3+荧光粉。进行 XRD、Rietveld 精修和 SEM 以鉴定结晶相和形态。详细研究了由紫外光激发的合成磷光体的光致发光特性。根据光致发光发射光谱和荧光衰减曲线，这些Tb 3+、Eu 3+共掺杂NaCaGd(WO 4 ) 3荧光粉发生了有效的能量转移。当Eu 3+的掺杂浓度达到92.267%离子达到 0.4 mol，主要的能量转移机制被确定为偶极-偶极相互作用。通过调整Tb 3+ /Eu 3+掺杂比，可以实现从绿色到红色的颜色可调性。此外，代表性的 NaCaGd(WO 4 ) 3 :0.6Tb 3+ ,0.1Eu 3+样品表现出优异的热稳定性，其在 423 K 时的发射强度仍保持初始温度 303 K 时的约 84.7%。最终，封装好的白光 LED 器件表现出出色的 4505 K 相关色温 (CCT) 和显色指数 ( R a) 的 87.3。上述结果表明，所有获得的荧光粉在显示器件和 pc-WLED 领域都是很有前途的候选者。
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