Phonon-Assisted Population Inversion in Lanthanide-Doped Upconversion Ba<sub>2</sub> LaF<sub>7</sub> Nanocrystals in Glass-Ceramics.
basic_science · Level V
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- Record sourced from PubMed, PMID 27379983.
- Also identified by DOI 10.1002/adma.201601405.
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Abstract
The effective population inversion of <sup>2</sup> H<sub>11/2</sub> from <sup>4</sup> S<sub>3/2</sub> state of Er<sup>3</sup><sup>+</sup> ions can be achieved through the annihilation of phonons; random lasing action from BLF films embedded with Yb<sup>3+</sup> /Er<sup>3+</sup> codoped BLF nanocrystals is demonstrated and high ambient temperature (>433 K) operation lasers with a very low excitation threshold (<530 nJ cm<sup>-2</sup> ) are realized.