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La2O2SO4:RE/Yb new phosphors for near infrared to visible and near infrared upconversion luminescence (RE=Ho, Er, Tm).
- Source :
- Journal of the American Ceramic Society; Jul2018, Vol. 101 Issue 7, p2701-2706, 6p, 3 Graphs
- Publication Year :
- 2018
-
Abstract
- Abstract: The 3 new upconversion (UC) phosphors of La<subscript>2</subscript>O<subscript>2</subscript>SO<subscript>4</subscript>:RE/Yb (RE=Ho, Er, and Tm, respectively) were derived via facile dehydration of their layered hydroxide precursors that were hydrothermally synthesized at 100°C. Rietveld XRD refinement found contracting cell dimension with decreasing RE<superscript>3+</superscript> size, confirming the direct crystallization of solid solution. The Er<superscript>3+</superscript> and Ho<superscript>3+</superscript> activators both exhibited simultaneous green and red (dominant) emissions under 978‐nm near‐infrared (NIR) laser excitation (NIR‐Vis UC). Particularly, Tm<superscript>3+</superscript> produced a Gaussian‐shaped pure NIR emission band at ~812 nm via its <superscript>3</superscript>H<subscript>4</subscript> → <superscript>3</superscript>H<subscript>6</subscript> transition (NIR‐NIR UC), which is highly desired for NIR biological application. Analysis of the excitation‐power dependent UC properties manifested a 3‐photon mechanism for the 3 phosphors, and the possible photon reactions leading to UC were illustrated. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOSPHORS
GAUSSIAN distribution
PHOTONS
CRYSTALLIZATION
NEAR infrared spectroscopy
Subjects
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 101
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 129426675
- Full Text :
- https://doi.org/10.1111/jace.15477