Photon-avalanche upconversion of Ho~(3+) in NaYF_4 and enhancement of violet,blue and green emissions induced by sensitization of Tm~(3+)

Huabing Zhang; Yanyan Bu; Xiaoliang Yang; Siguo Xiao; J.W. Ding

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Photon-avalanche upconversion of Ho~(3+) in NaYF_4 and enhancement of violet,blue and green emissions induced by sensitization of Tm~(3+)

机译：NaYF_4中Ho〜（3+）的光子雪崩上转换和Tm〜（3+）致敏引起的紫色，蓝色和绿色发射的增强

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Ho~(3+) singly doped and Ho~(3+)/Tm~(3+) co-doped hexagonal NaYF_(4) powders have been synthesized by a solid-state reaction method. Under excitation of 671 nm diode laser, upconverted blue, green and red emission bands are observed in Ho~(3+) singly doped sample. Temporal evolution and excitation power dependent behavior for the green emission are explored, indicating that a photon-avalanche mechanism is responsible for the upconversion processes in Ho~(3+) singly doped hexagonal NaY_4 sample. With the introduction of Tm~(3+), the intensities of both blue and green emissions of Ho~(3+) are efficiently enhanced, which are attributed to two energy transfer processes from Tm~(3+) to Ho~(3+), i.e.,~3F_4 (Tm~(3+)) + ~5I_8(Ho~(3+)) →~3H_6 (Tm~(3+)) + ~5I_7(Ho~(3+))and ~1G_4 (Tm~(3+)) + ~5I_8(Ho~(3+))→~3H_6 (Tm~(3+)) +~5F_3(Ho~(3+)). The result offers a new sensitization approach to enhance the upconversion efficiency of Ho3* under 671 nm excitation.

机译：通过固相反应法合成了Ho〜（3+）单掺杂和Ho〜（3 +）/ Tm〜（3+）共掺杂六方NaYF_（4）粉末。在671 nm二极管激光器的激发下，在Ho〜（3+）单掺杂样品中观察到上转换的蓝色，绿色和红色发射带。探索了绿色发射的时间演化和激发功率依赖性行为，表明在Ho〜（3+）单掺杂六角形NaY_4样品中，光子-雪崩机制负责上转换过程。随着Tm〜（3+）的引入，Ho〜（3+）的蓝色和绿色发射强度得到了有效增强，这归因于从Tm〜（3+）到Ho〜（3）的两个能量转移过程。 +），即〜3F_4（Tm〜（3+））+〜5I_8（Ho〜（3+））→〜3H_6（Tm〜（3+））+〜5I_7（Ho〜（3+））和〜 1G_4（Tm〜（3+））+〜5I_8（Ho〜（3 +））→〜3H_6（Tm〜（3+））+〜5F_3（Ho〜（3+））。结果提供了一种新的敏化方法，以增强Ho3 *在671 nm激发下的上转换效率。

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来源
《Materials Science and Engineering》 |2011年第3期|p.256-259|共4页
作者
Huabing Zhang; Yanyan Bu; Xiaoliang Yang; Siguo Xiao; J.W. Ding;
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Institute for Nanophysics and Rare-earth Luminescence. Xiangtan University, Xiangtan 411105, Hunan, China;

Institute for Nanophysics and Rare-earth Luminescence. Xiangtan University, Xiangtan 411105, Hunan, China;

Institute for Nanophysics and Rare-earth Luminescence. Xiangtan University, Xiangtan 411105, Hunan, China;

Institute for Nanophysics and Rare-earth Luminescence. Xiangtan University, Xiangtan 411105, Hunan, China;

Institute for Nanophysics and Rare-earth Luminescence. Xiangtan University, Xiangtan 411105, Hunan, China;

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ho~(3+) upconversion photon-avalanche energy transfer;

机译：ho〜（3+）上转换光子-雪崩能量转移;

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2. Hydrothermal synthesis and the enhanced blue upconversion luminescence of NaYF_4:Nd~(3+),Tm~(3+),Yb~(3+) [J] . Sun J., Zhang W., Du H., Infrared physics and technology . 2010,第5期

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Photon-avalanche upconversion of Ho~(3+) in NaYF_4 and enhancement of violet,blue and green emissions induced by sensitization of Tm~(3+)

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