Upconversion-Assisted Persistent Luminescence in Glass Composites

- 342825
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Abstract

A tellurite glass-particle composite was designed to enable NIR-activated persistent luminescence through the coupling of upconversion and persistent luminescent materials. The system combines Zn1.33Ga1.33Sn0.33O4:Cr3+ (ZGSO:Cr3+) particles, which emit in the deep-red/NIR region, with a 70TeO2–15GeO2–5K2O–10Bi2O3:Yb3+,Er3+ (TGKB:Yb3+,Er3+) tellurite glass matrix capable of converting 980 nm excitation into visible emission. The spectral overlap between the Er3+ upconversion emission and the excitation range of ZGSO:Cr3+ allows indirect activation of persistent luminescence under NIR light. The results suggest a radiative emission–reabsorption pathway and highlight glass-particle composites as multifunctional photonic platforms for deep-red/NIR persistent emission activated by biologically safer excitation wavelengths.

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Institutions
  • 1 Chemistry Institute of São Carlos (IQSC), University of São Paulo (USP)
  • 2 Universidade de São Paulo
  • 3 Universidade Presbiteriana Mackenzie | (Mackenzie Presbyterian University)
Track
  • TL04 - Rare Earth Chemistry and Applications
Keywords
Photonic glass composites
Upconversion
NIR-activated persistent luminescence