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YNbO4：Tm3+/Yb3+上转换发光特性研究
Up-conversion Luminescent Properties of YNbO4: Tm3+/Yb3+
- 发光学报 2018年39卷第4期 页码：449-456
- 作者机构：
北京信息科技大学 仪器科学与光电工程学院, 北京 100192
- 作者简介：
- 基金信息：北京市自然科学基金（4154071）();北京市优秀人才培养资助青年骨干个人项目（201400002012G105）资助()
DOI：10.3788/fgxb20183904.0449
中图分类号： O482.31纸质出版日期：2018-4-5，
网络出版日期：2017-11-3，
收稿日期：2017-8-11，
修回日期：2017-10-6，
扫 描 看 全 文
李磊伟, 吕勇, 牛春晖等. YNbO<sub>4</sub>：Tm<sup>3+</sup>/Yb<sup>3+</sup>上转换发光特性研究[J]. 发光学报, 2018,39(4): 449-456
LI Lei-wei, LYU Yong, NIU Chun-hui etc. Up-conversion Luminescent Properties of YNbO<sub>4</sub>: Tm<sup>3+</sup>/Yb<sup>3+</sup>[J]. Chinese Journal of Luminescence, 2018,39(4): 449-456
李磊伟, 吕勇, 牛春晖等. YNbO<sub>4</sub>：Tm<sup>3+</sup>/Yb<sup>3+</sup>上转换发光特性研究[J]. 发光学报, 2018,39(4): 449-456 DOI： 10.3788/fgxb20183904.0449.
LI Lei-wei, LYU Yong, NIU Chun-hui etc. Up-conversion Luminescent Properties of YNbO<sub>4</sub>: Tm<sup>3+</sup>/Yb<sup>3+</sup>[J]. Chinese Journal of Luminescence, 2018,39(4): 449-456 DOI： 10.3788/fgxb20183904.0449.
摘要
按照50Nb
2
O
5
-（46-
x
）Y
2
O
3
-4Yb
2
O
3
-
x
Tm
2
O
3
（
x
=0.1，0.2，0.5，1，2）的配比方式，采用高温固相法制备出了掺杂Tm
3+
/Yb
3+
的YNbO
4
晶体粉末。在980 nm红外光激发下，观测到波长为478，645，707 nm的上转换荧光，分别对应于Tm
3+
离子的
1
G
4
3
H
6
、
1
G
4
3
F
4
、
3
F
3
3
H
6
能级跃迁过程。利用上转换发射功率与980 nm激光器工作电流关系估算出跃迁过程吸收光子数目为2.72，2.69，2.01，从而确定出前两者为三光子吸收过程，最后一个对应于双光子吸收过程。运用Judd-Ofelt理论研究样品光谱特性，根据样品的吸收谱得到样品的谱线强度参数
t
（t
=2，4，6），进而得出理论振子强度及实验振子强度，二者均方根偏差
rms
=1.29910
-7
。计算了Tm
3+
离子向下能级跃迁的跃迁几率、跃迁分支比等参数。最后得出结论：（1）
3
F
4
能级寿命较长，适合作为上转换中间能级；（2）
3
H
5
能级寿命较长，且
3
H
5
3
H
6
跃迁分支比（96.46%）接近100%，可用于产生1 216 nm激光。
Abstract
Tm
3+
/Yb
3+
droped YNbO
4
power sample was prepared with the molar ratios of 50Nb
2
O
5
-(46-
x
)Y
2
O
3
-4Yb
2
O
3
-
x
Tm
2
O
3
(
x
=0.1
0.2
0.5
1
2) by the high temperature solid state method at 1 300℃. Under 980 nm laser excitation
the upconversion luminescence spectra of samples show 478 nm from
1
G
4
3
H
6
transition of Tm
3+
ions
645 nm attributed to
1
G
4
3
F
4
transition of Tm
3+
ions
respectively
and 707 nm emissions assigned to
3
F
3
3
H
6
transition of Tm
3+
ions. The transition process is estimated by using the relation between the upconversion power and the operating current of the 980 nm laser. The numbers of photons absorbed are 2.72
2.69 and 2.01. The first two correspond to three-photon absorption processes
and the last one corresponds to two-photon absorption process. The spectral properties of the samples are studied by using Judd-Ofelt theory. Spectral strength parameters
t
(
t
=2
4
6) were computed based on the absorption peak's area of the absorption spectrum. The theoretical oscillator strength and the experimental oscillator strength were calculated according to the spectrum strength parameters
and the root mean square deviation (
rms
) was 1.29910
-7
. The transition probability
branching ratio and other parameters of the lower level transition of Tm
3+
ion were calculated. The results show that:(1) the
3
F
4
has a longer level lifetime
which is suitable for up-conversion intermediate level; (2)
3
H
5
has a longer level lifetime
and the transition branching ratio of
3
H
5
3
H
6
is close to 100%(96.46%)
so this sample can be used to generate 1 216 nm laser.
关键词
Tm3+YNbO4上转换发光J-O理论
Keywords
Tm3+YNbO4up conversion luminescenceJ-O theory
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