Disorder driven asymmetry and singular red emission in doped Lu2Hf2O7 nanocrystals with no charge compensating defects
Disorder driven asymmetry and singular red emission in doped Lu2Hf2O7 nanocrystals with no charge compensating defects
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DOI：
10.1016/j.jlumin.2021.118057
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发表时间：
2021-07
影响因子：
3.6
通讯作者：
S. Gupta;Mitzy A. Penilla Garcia;J. Zuniga;B. B. Srivastava-B.;Yuanbing Mao
中科院分区：
文献类型：
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作者：
S. Gupta;Mitzy A. Penilla Garcia;J. Zuniga;B. B. Srivastava-B.;Yuanbing Mao
高性能发光材料具有低对称性、高色纯度、无电荷补偿缺陷、高量子产率等特点。在这项工作中，我们已经合成了Lu 2 Hf 2 O 7（LuHO）和Lu 2 Hf 2 O 7：Eu 3+（LuHOE）纳米晶体（NC）使用熔盐合成，并证实，两者都是稳定的缺陷萤石结构与高度的结构无序。LuHO纳米材料在紫外光照射下呈现出绿色发光，在氧化和还原环境中处理后，其发光强度分别降低和增加，证实了氧空位在发光过程中的作用. LuHOE NC（i）显示出激发波长相关的主体到掺杂剂的能量转移效率，（ii）给出具有~ 95%的高色纯度的单一红色发射，（iii）具有由Eu 3+离子占主导地位的Lu 3+位点而不形成电荷补偿缺陷（CCD），以及（iv）具有~ 88%的量子产率的低非辐射通道。我们相信这些具有奇异红色发射、高量子产率和通过结构无序获得的色纯度以及不存在CCD的LuHOE NC作为高效磷光体值得进一步研究。
High performance luminescent materials possess low symmetry, high color purity, no charge compensating defects, and high quantum yield. In this work, we have synthesized Lu2Hf2O7(LuHO) and Lu2Hf2O7:Eu3+(LuHOE) nanocrystals (NCs) using a molten salt synthesis and confirmed that both are stabilized in defect fluorite structure with a high degree of structural disordering. The LuHO NCs depicted green emission under ultraviolet irradiation, which decreases and increases after being treated in oxidizing and reducing environments, respectively, confirming the role of oxygen vacancies in the emission process. The LuHOE NCs (i) show excitation wavelength-dependent host to dopant energy transfer efficiency, (ii) give a singular red emission with high color purity of ~95%, (iii) have a dominant occupation of the Lu3+sites by Eu3+ions without the formation of charge compensating defects (CCDs), and (iv) possess low non-radiative channels with a quantum yield of ~88%. We believe these LuHOE NCs with singular red emission, high quantum yield, and color purity acquired through structural disordering and the absence of CCDs warrant further investigation as efficient phosphors.