Upconversion Yb3+/Er3+:La2Ti2O7 phosphors for solid-state lighting and optical thermometry

Murat Erdem*, Selim Burak Cantürk, Gönül Eryürek

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18 Atıf (Scopus)

Özet

The solid-state reaction was employed as a suitable method to produce orthorhombic Yb3+/Er3+ co-doped La2Ti2O7 phosphors. The pump power and temperature dependencies of spectra of the Yb3+/Er3+ co-doped La2Ti2O7 were studied for color tunability and optical thermometry. The pump power significantly affected the color coordinates of the phosphors. The upconversion green light transformed to the broad white light at higher pump power. A two-photon transition was proposed to explain the upconversion energy transfer process. The fluorescence intensity ratio technique was used to calculate the optical temperature sensor sensitivities. The ΔE energy difference obtained from the intensity ratios of the thermally coupled 2H11/2 and 4I15/2 energy levels of Er3+ are 763.64 ± 76.62 cm−1, 777.77 ± 44.62 cm−1, 640.71 ± 137.39 cm−1 for La1.95Yb0.04Er0.01Ti2O7, La1.94Yb0.04Er0.02Ti2O7, and La1.93Yb0.04Er0.03Ti2O7, respectively. Absolute temperature sensitivities of the phosphors decreased with increasing Er3+ concentration. The maximum absolute sensitivity was determined to be 0.51x10-2 K−1 at 553 K for La1.95Yb0.04Er0.01Ti2O7, 0.64x10-2 K−1 at 571 K for La1.94Yb0.04Er0.02Ti2O7, and 0.38x10-2 K−1 at 457 K for La1.93Yb0.04Er0.03Ti2O7.

Orijinal dilİngilizce
Makale numarası120854
DergiSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Hacim270
DOI'lar
Yayın durumuYayınlandı - 5 Nis 2022

Bibliyografik not

Publisher Copyright:
© 2022 Elsevier B.V.

Finansman

Marmara University Scientific Research Project Coordination Unit (BAPKO) supported this study with the project number (FEN-E-090517-276). The ICP-OES measurements of the Yb 3+ /Er 3+ :La 2 Ti 2 O 7 phosphors were carried out at the Scientific and Technological Research Council of Turkey (TUBITAK). Marmara University Scientific Research Project Coordination Unit (BAPKO) supported this study with the project number (FEN-E-090517-276). The ICP-OES measurements of the Yb3+/Er3+:La2Ti2O7 phosphors were carried out at the Scientific and Technological Research Council of Turkey (TUBITAK).

FinansörlerFinansör numarası
TUBITAK
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Marmara ÜniversitesiFEN-E-090517-276

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