Abstract

${\rm{L}}{{\rm{a}}_2}{\rm{Mo}}{{\rm{O}}_6}:\;{\rm{Y}}{{\rm{b}}^{3 +}},\;{\rm{E}}{{\rm{r}}^{3 +}}$ upconversion (UC) micro-crystals with a tetragonal structure were fabricated through a modified sol–gel method. The samples are found to be spherical in shape with a diameter of about 300 nm. Upon excitation of 980 nm light, the UC emission spectra of the phosphors exhibit green and red bands corresponding to the characteristic transitions of ${\rm{E}}{{\rm{r}}^{3 +}}$ ions. As ${\rm{Y}}{{\rm{b}}^{3 +}}$ concentration rises, the green emission intensity increases and reaches the maximum at 2.0% ${\rm{Y}}{{\rm{b}}^{3 +}}$ content, while the ratio of green/red emission intensities (${I_G}/{I_R}$) declines monotonically. Temperature sensing capability was studied employing the fluorescent intensity ratio technique from the thermally coupled levels ${^2{{\rm{H}}_{11/2}}}$ and ${^4{{\rm{S}}_{3/2}}}$ of ${\rm{E}}{{\rm{r}}^{3 +}}$ in temperature range of 293${\sim}$533 K. It is interesting to find that ${\rm{Y}}{{\rm{b}}^{3 +}}$ concentration has influence on the absolute sensitivity ${S_A}$, while the relative sensitivity ${S_R}$ is almost independent of ${\rm{Y}}{{\rm{b}}^{3 +}}$ content. Furthermore, excellent thermal stability and high temperature sensitivity is also demonstrated in the 2.0% ${\rm{Y}}{{\rm{b}}^{3 +}}$-doped sample with the obtained maximum ${S_A}$ and ${S_R}$ as high as ${0.008}\;{{\rm{K}}^{- 1}}$ and ${1.093}\% \;{{\rm{K}}^{- 1}}$, respectively. The experimental results indicate that ${\rm{Y}}{{\rm{b}}^{3 +}}/{\rm{E}}{{\rm{r}}^{3 +}}$ co-doped ${\rm{L}}{{\rm{a}}_2}{\rm{Mo}}{{\rm{O}}_6}$ phosphors can be excellent candidates for temperature sensing applications.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Optical thermometry based on upconversion luminescence of Yb3+-Er3+ and Yb3+-Ho3+ doped Y6WO12 phosphors

Songsong An, Jia Zhang, and Lei Zhao
Appl. Opt. 58(27) 7451-7457 (2019)

Upconversion luminescence of Ba3La(PO4)3:Yb3+-Er3+/Tm3+ phosphors for optimal temperature sensing

Jiafeng Cao, Jia Zhang, and Xiaowei Li
Appl. Opt. 57(6) 1345-1350 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription