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首页> 外文期刊>Journal of Advanced Science >Tm,YbドープBaGd2ZnO5アップコンバージョン蛍光体の合成と発光特性評価
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Tm,YbドープBaGd2ZnO5アップコンバージョン蛍光体の合成と発光特性評価

机译：Tm，Yb掺杂的BaGd 2 ZnO 5 上转换磷光体合成和发射特性评估

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Up-conversion phosphors emit light by excitation of light of which wavelength is longer than that of emission. This phenomena is caused by multi-photon excitation and energy transfer in f orbital of rare earth elements. In this study, BaGd_(2)ZnO_(5) doped with different amount of Tm and Yb were prepared, and their up-conversion emissions were measured. Main phase of the prepared samples were identified as BaGd_(2)ZnO_(5) by X-ray diffraction. Up-conversion emissions were measured using multi-channel photo detector and 980 nm diode laser, and the optimum amount of Tm and Yb were 0.3% and 7% respectively for the up-conversion emission. The optimized sample showed blue, red, and near infrared emissions. Excitation power intensity dependence of each emission was investigated by changing the excitation laser power. Blue emission intensity was proportional to the 2.5th power of the excitation, and near infrared emission was proportional to the 1.8th power of the excitation. These results indicate blue up-conversion emission is 3 photon excitation process and near infrared emission is 2 photon excitation process. Quantum efficiency was measured using fluorescence spectrometer equipped with integral sphere. Absorption rate of 980 nm was 22.68%. Internal quantum efficiency of blue emission was 0.02%, and of near infrared was 2.38%.
机译：上转换磷光体通过激发波长比发射波长更长的光来发射光。这种现象是由稀土元素轨道中的多光子激发和能量转移引起的。在这项研究中，制备了掺有不同量的Tm和Yb的BaGd_（2）ZnO_（5），并测量了它们的上转换辐射。制备的样品的主相通过X射线衍射鉴定为BaGd_（2）ZnO_（5）。使用多通道光电探测器和980 nm二极管激光器测量了上转换发射，上转换发射的最佳Tm和Yb的最佳量分别为0.3％和7％。优化的样品显示出蓝色，红色和近红外发射。通过改变激发激光功率来研究每种发射的激发功率强度依赖性。蓝色发射强度与激发的2.5次方成正比，近红外发射与激发的1.8次方成正比。这些结果表明蓝色上转换发射是3光子激发过程，而近红外发射是2光子激发过程。使用配备有积分球的荧光光谱仪测量量子效率。 980nm的吸收率为22.68％。蓝色发射的内部量子效率为0.02％，近红外的内部量子效率为2.38％。

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