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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Luminescence and Transport Behavior in Incommensurately Modulated CaGd2(MoO4)4:Yb/Er.

Yinghan Wang1, Zeyue Zhang2, Guohong Cai2

  • 1State Key Lab of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.

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Thermal quenching in luminescent materials is worsened by ion migration above 300°C, activating phonons and increasing scattering. This study reveals phonon scattering dynamics in CaGd2(MoO4)4:Yb/Er, crucial for designing robust infrared emitters.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Luminescence

Background:

  • Thermal quenching reduces luminescent material efficiency by generating phonons.
  • Phonon transport's role in thermal quenching is often overlooked, especially in complex structures.
  • Incommensurate scheelite structures show promise for luminescence but require understanding thermal behavior.

Purpose of the Study:

  • Investigate thermal quenching dynamics of near-infrared emission in CaGd2(MoO4)4:Yb/Er.
  • Elucidate the influence of phonon transport and scattering on luminescence efficiency.
  • Provide insights for developing thermally stable luminescent materials.

Main Methods:

  • Temperature-dependent studies of electrical conductivity, luminescence intensity, thermal conductivity, and Raman scattering.
  • Analysis of phonon activation and scattering mechanisms.
  • Investigating ion migration effects on material properties.

Main Results:

  • Distinct temperature-dependent changes observed in electrical conductivity, luminescence, thermal conductivity, and Raman scattering.
  • Thermally induced ion migration above ~300°C activates phonons and enhances phonon-defect scattering.
  • Reduced thermal conductivity and accelerated multiphonon relaxation of Er3+ emission levels observed.

Conclusions:

  • Thermally induced ion migration is a key factor in luminescence quenching in this system.
  • Phonon scattering dynamics significantly impact thermal quenching.
  • Findings are critical for designing thermally robust near-infrared luminescent materials for optical applications.