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The effective population inversion of 2H11/2 from 4S3/2 state of Er3+ions can be achieved through the annihilation of phonons; random lasing action from BLF films embedded with Yb3+/Er3+ codoped BLF nanocrystals is demonstrated and high ambient temperature (>433 K) operation lasers with a very low excitation threshold (<530 nJ cm−2) are realized.
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Xu et al. (2016) studied this question.
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