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Abstract A new ratiometric Boltzmann thermometry approach is presented for the narrow-line red-emitting bright phosphor Al0.993Cr0.007B4O6N. It relies on thermalization between the two excited states 2Eg(2G) and 2T1g(2G) of Cr3+ with an energy gap of 620 cm−1 for optimized thermometry at room temperature. It is shown that nonradiative coupling between these excited states is very fast, with rates in the order of several µs−1.
1 Introduction Compounds with the general sum formula MIIB4O7, with MII as a divalent metal cation, are ubiquitously found among borates. Interestingly, a closer look reveals that several structure types are described by this general sum formula, leading to the multifaceted crystal chemistry of the MIIB4O7 compounds.
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