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Multiphonon relaxationMultiphonon relaxation and energy transferEnergy transfer are central processes governing the luminescent behavior of REI-doped materials, directly impacting emission lifetime, intensity, and efficiency. Multiphonon relaxationMultiphonon relaxation acts as a non-radiative decay pathway through phonon-assisted de-excitation, which can either suppress luminescenceLuminescence or promote energy redistribution depending on the host phonon energy and energy gap between electronic states. Concurrently, energy transferEnergy transfer processes, such as donor–donor migration and donor–acceptor interactions, can enhance radiative output or induce concentration quenching through cross-relaxation. The interplay between these mechanisms determines the population dynamics of excited states and drives key optical phenomena relevant to up-conversionUp-conversion, down-conversion, and cooperative sensitization. This chapter examines the physical origins and kinetic modeling of these processes, emphasizing their microscopic parameters and their influence on luminescence decayLuminescence decay profiles. Understanding this balance provides critical insight for engineering advanced materials for lasers, optical amplifiers, and photon management technologies.

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Multiphonon Processes and Energy Transfer Processes

  • 章节

  • 发表日期：

    2026年

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  • G. Lozano C.,
  • J. Chacaliaza-Ricaldi,
  • J. F. M. dos Santos,
  • E. Marega Jr.,
  • Y. Messaddeq,
  • V. A. G. Rivera

摘要

Multiphonon relaxationMultiphonon relaxation and energy transferEnergy transfer are central processes governing the luminescent behavior of REI-doped materials, directly impacting emission lifetime, intensity, and efficiency. Multiphonon relaxationMultiphonon relaxation acts as a non-radiative decay pathway through phonon-assisted de-excitation, which can either suppress luminescenceLuminescence or promote energy redistribution depending on the host phonon energy and energy gap between electronic states. Concurrently, energy transferEnergy transfer processes, such as donor–donor migration and donor–acceptor interactions, can enhance radiative output or induce concentration quenching through cross-relaxation. The interplay between these mechanisms determines the population dynamics of excited states and drives key optical phenomena relevant to up-conversionUp-conversion, down-conversion, and cooperative sensitization. This chapter examines the physical origins and kinetic modeling of these processes, emphasizing their microscopic parameters and their influence on luminescence decayLuminescence decay profiles. Understanding this balance provides critical insight for engineering advanced materials for lasers, optical amplifiers, and photon management technologies.