Fig. 2: Boltzmann-type luminescence thermometry with Cr3+ in AlB4O6N. | Light: Science & Applications

Fig. 2: Boltzmann-type luminescence thermometry with Cr3+ in AlB4O6N.

From: Ratiometric Boltzmann thermometry with Cr3+ in strong ligand fields: Efficient nonradiative coupling for record dynamic working ranges

Fig. 2

a Temperature-dependent normalized emission spectra of Al0.993Cr0.007B4O6N in a semi-logarithmic scale. The integration ranges for the 2T1g(2G) → 4A2g(4F) and 2Eg(2G) → 4A2g(4F) transitions are highlighted as grey areas, respectively. b Plot of the temperature-dependent LIR R21(T) between the integrated intensities of the 2T1g(2G) → 4A2g(4F) and 2Eg(2G) → 4A2g(4F)-based emission lines against the inverse temperature. The red lines are the least-squares fit to Eq. 1. The errors in b were estimated assuming Poissonian photon counting statistics of the photomultiplier

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