“…Quite recently, a new peroxo complex, namely, the calcium peroxide diperoxohydrate (CaO 2 × 2H 2 O 2 ), has been reported to produce the 1270-nm emission of 1 O 2 (yield is 25%) upon decomposition. The IR−CL emission of singlet oxygen at 1270 nm was also detected in the V 5+ -catalyzed decomposition of H 2 O 2 in acetic acid, presumably through the intermediary diperoxo species. Similarly, singlet-oxygen infrared CL was produced in the catalyzed disproportionation of hydrogen peroxide by lanthanum(III) ions under heterogeneous conditions …”