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首页> 外文期刊>Key Engineering Materials >Enhancement of Blue Emission via Upconversion in Solid-state Synthesized Hexagonal NaYF_4:Ln~(3+)
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Enhancement of Blue Emission via Upconversion in Solid-state Synthesized Hexagonal NaYF_4:Ln~(3+)

机译：固态合成六角形NaYF_4：Ln〜（3+）中上转换引起的蓝色发射增强

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摘要

Hexagonal NaYF_4:Ln~(3+) (Ln~(3+)=Yb~(3+) and Tm~(3+)) was prepared via solid-state synthesis route. The synthesized powders were identified with X-ray diffraction patterns. Hexagonal phase was obtained by heating the powders at 550℃ in reducing atmosphere, and the ions of Yb~(3+) and Tm~(3+) were completely incorporated into the lattice of hexagonal NaYF_4 in the doping concentration range. Microstructure of the phosphor was observed by scanning electron microscopy (SEM). Intense blue (~1G_4→~3H_6,~1D_2→~3F_4) and weak red (~1G_4→ ~3F_4) upconversion emission of Tm~(3+) ions with the energy transferred from Yb~(3+) ions were observed in the phosphor excited with a 980nm continuous wave laser diode. The intensity of blue emission was effectively enhanced by suitable doping of Tm and Yb ions, and strongest blue emission was obtained with the concentration of 0.2mol% Tm~(3+) and 40mol% Yb~(3+) doped.
机译：通过固态合成路线制备了六角形的NaYF_4：Ln〜（3+）（Ln〜（3 +）= Yb〜（3+）和Tm〜（3+））。合成粉末通过X射线衍射图鉴定。通过在还原气氛下于550℃加热粉末得到六方相，并在掺杂浓度范围内将Yb〜（3+）和Tm〜（3+）的离子完全掺入六方NaYF_4的晶格中。通过扫描电子显微镜（SEM）观察到磷光体的微结构。观察到Tm〜（3+）离子具有强烈的蓝色（〜1G_4→〜3H_6，〜1D_2→〜3F_4）和弱红色（〜1G_4→〜3F_4）上转换发射，并且具有从Yb〜（3+）离子转移的能量。荧光粉由980nm连续波激光二极管激发。通过适当掺入Tm和Yb离子，有效地提高了蓝色发射的强度，掺杂浓度为0.2mol％的Tm〜（3+）和40mol％的Yb〜（3+）获得了最强的蓝色发射。

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