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Radioluminescence (RL) and negative thermal quenching (NTQ). Temperature-dependent RL for (a) undoped and (b) Rb-doped BA2PbBr4 and (c) undoped and (d) Rb-doped PEA2PbBr4. Integrated RL for undoped and Rb-doped (e) BA2PbBr4 and (f) PEA2PbBr4. The solid lines represent the negative thermal quenching fit.
