Upconverted luminescence from nonequilibrium vibronic states of Cr ions in forsterite

S. G. Demos, R. R. Alfano

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Nonequilibrium excited vibronic states of photoexcited Cr4+ ions in a forsterite crystal were studied using picosecond laser excitation and ultrasensitive photon counting detection. The excitation involves the absorption of two photons per photoexcited ion by means of excited-state absorption. Discrete peaks are observed in the hot upconverted luminescence spectrum and are attributed to the population of nonequilibrium vibronic levels during the deexcitation of the ions by phonon emission. This work reveals some of the phonon modes participating in the nonradiative relaxation of the photoexcited ions. The shape of the luminescence spectral envelope suggests a bottleneck in the nonradiative decay at about 2.1 eV from coupling between the 1E and 3T1 states.

Original languageEnglish (US)
Pages (from-to)8811-8817
Number of pages7
JournalPhysical Review B
Issue number14
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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