Highly efficient cyan-emitting garnet Ca3Hf2SiAl2O12: xCe3+ phosphor for solid state white lighting
Highly efficient cyan-emitting garnet Ca3Hf2SiAl2O12: xCe3+ phosphor for solid state white lighting
复制标题
高效青色发射石榴石 Ca3Hf2SiAl2O12：用于固态白光照明的 xCe3 荧光粉
DOI：
10.1039/c5ce00020c
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发表时间：
2015-01-01
期刊：
影响因子：
3.1
通讯作者：
Wang, Yuhua
中科院分区：
文献类型：
--
作者：
Ding, Xin;Zhu, Ge;Wang, Yuhua
本文合成了一种新的石榴石结构化合物Ca 3 Hf 2SiAl 2 O 12和一系列Ce ~（3+）掺杂的Ca 3 Hf 2SiAl 2 O 12：xCe ~（3+）荧光粉。研究了Ca 3 Hf 2SiAl 2 O 12：xCe 3+的晶体结构和发光性能。透射电镜分析和XRD Rietveld精修表明，Ca 3 Hf 2SiAl 2 O 12为体心立方结构，属Iad（230）空间群，a = 12.3666 A。Ca3Hf2SiAl2O12：xCe 3+在330和400 nm处具有宽的激发带，这归因于Ce 3+的特征5d-4f跃迁，并且在400 nm紫外光激发下可以产生青色发射。CHSA：1%Ce ~（3+）荧光粉的发光强度可达到YAG：Ce ~（3+）（商品）的68.9%和Ca_8Mg（SiO_4）_4Cl_2：Eu ~（2+）（商品）的72.1%。Ca_3Hf_2SiAl_2O_（12）：1%Ce ~（3+）的平均寿命为48.91ns，符合Ce ~（3+）的纳秒特性。在温度从25 °C升高到250 °C的过程中，Ca_3Hf_2SiAl_2O_（12）：0.5%Ce ~（3+）的积分发光强度仅下降到57.8%（250 °C），与商业YAG：Ce ~（3+）（P46-Y_3）相比显示出良好的热稳定性。此外，Ca 3 Hf 2SiAl 2 O 12：0.5%Ce3+具有优异的量子效率（74.7%）。结果表明，Ca 3 Hf 2SiAl 2 O 12：xCe 3+具有优异的光学性能，可用于紫外发光二极管。
In this paper, we have synthesized a new garnet structure compound Ca3Hf2SiAl2O12 and a series of Ce3+-doped Ca3Hf2SiAl2O12: xCe3+ phosphors. The crystal structure and luminescence properties of the Ca3Hf2SiAl2O12: xCe3+ are investigated in detail. Transmission electron microscopy analysis and XRD Rietveld refinement shows that Ca3Hf2SiAl2O12 is body-centered cubic and belongs to Iad (230) space-group with a = 12.3666 A. Ca3Hf2SiAl2O12: xCe3+ has broad excitation bands at 330 and 400 nm attributed to the characteristic Ce3+ 5d–4f transition and can produce cyan emission under 400 nm UV light excitation. The emission intensity of CHSA: 1%Ce3+ phosphor can reach 68.9% of YAG: Ce3+ (commercial) and 72.1% of Ca8Mg(SiO4)4Cl2: Eu2+ (commercial). The average decay lifetime of Ca3Hf2SiAl2O12: 1%Ce3+ is 48.91 ns, which is consistent with the nanosecond peculiarity of Ce3+. In the process of increasing the temperature from 25 °C to 250 °C, the integrated emission intensity of Ca3Hf2SiAl2O12: 0.5%Ce3+ only decreases to 57.8% (250 °C) and shows nice thermal stability compared with commercial YAG: Ce3+(P46-Y3). Furthermore, Ca3Hf2SiAl2O12: 0.5%Ce3+ exhibits outstanding quantum efficiency (74.7%). It reveals that Ca3Hf2SiAl2O12: xCe3+ possesses remarkable optical properties and can be utilized in UV-LEDs.