Luminescence Properties of Ho2O3-Doped Y2O3 Stabilized ZrO2 Single Crystals
Luminescence Properties of Ho2O3-Doped Y2O3 Stabilized ZrO2 Single Crystals
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DOI：
10.3390/cryst12030415
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发表时间：
2022-03
期刊：
影响因子：
2.7
通讯作者：
Yuhua Yang;Shoulei Xu;Si-Qiu Li;Wen-Xin Wu;Yihua Pan;Daini Wang;X. Hong;Zhe Cheng;Wen Deng
中科院分区：
文献类型：
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作者：
Yuhua Yang;Shoulei Xu;Si-Qiu Li;Wen-Xin Wu;Yihua Pan;Daini Wang;X. Hong;Zhe Cheng;Wen Deng
采用光学浮区法生长了不同Y2 O3和Ho 2 O3含量的Ho 2 O3掺杂Y2 O3稳定的ZrO 2（YSZ）单晶。XRD和拉曼光谱测试表明，样品均为四方晶系结构。正电子湮没寿命谱的测量结果表明，随着Y2 O3掺杂浓度的增加，晶体中的缺陷增多，平均正电子寿命增加，光散射增强，发光强度和量子产额（QY）降低。在446 nm激发下，Ho 2 O3掺杂YSZ晶体的光致发光（PL）谱在540、551、670和757 nm处分别出现了对应于Ho 3+从5S 2、5 F4、5 F5和5I 4激发态到5I 8基态跃迁的发射峰。在低掺杂浓度（0.10-0.50 mol%）下，随Ho 2 O3含量的增加，发光强度增加，在0.50 mol%时达到最大值，然后随Ho 2 O3含量的增加而降低，这可能是由于Ho 3+离子之间的相互作用增加而引起的非辐射弛豫增加。当Ho_2O_3浓度> 0.5mol%时，由于电偶极-偶极相互作用，荧光发生猝灭。计算的色品坐标（CIE）约为（0.307，0.683），色纯度达到99.6%。结果表明，Ho 2 O3：YSZ晶体适合于制作绿色发光器件。
Single crystals of Ho2O3-doped Y2O3 stabilized ZrO2 (YSZ) with different Y2O3 and Ho2O3 contents were grown by the optical floating zone method. XRD and Raman spectra were measured and showed that crystal samples all had tetragonal structures. Measurements of positron annihilation lifetime spectra indicated that the increase in Y2O3 concentration led to the increases of defects and mean positron lifetime, which enhanced the scattering of light and reduced the luminous intensity and the quantum yield (QY) of the crystal. Under the excitation at 446 nm, photoluminescence (PL) spectra of Ho2O3-doped YSZ crystals showed emission peaks at 540, 551, 670, and 757 nm corresponding to Ho3+ transitions from 5S2, 5F4, 5F5, and 5I4 excited states to the 5I8 ground state, respectively. At low Ho2O3-doped concentrations (0.10–0.50 mol%), the overall emission intensity increased with Ho2O3 contents, reached the maximum value at 0.50 mol%, then decreased with higher Ho2O3 contents, probably as a result of increased non-radiative relaxation caused by increased interactions between Ho3+ ions. Quenching of the PL occurred at Ho2O3 concentrations > 0.5 mol% and due to the electric dipole–dipole interaction. The calculated chromaticity coordinates (CIE) were approximately (0.307, 0.683) and the color purity achieved 99.6%. The results showed that Ho2O3: YSZ crystals were suitable for green light-emitting devices.