Dual-mode luminescence temperature sensing performance of manganese (II) doped CsPbCl3 perovskite quantum dots

Perovskite quantum dots (QDs) have attracted much attention owing to their specific structures. Doping of metal ions has been extensively investigated to endow QDs with novel optical, electronic, magnetic properties. Herein, we demonstrate an effective strategy to realized excellent dual mode luminescence thermometry based on manganese(II) doped CsPbCl3 QDs. Photoluminescence quantum yield (PLQY) is improved almost 10 times from 4.8% for undoped CsPbCl3 to 47.3% for CsPbCl3:0.1Mn2+ QDs. The long-term stability is achieved by substitution of Pb2+ by smaller Mn2+ ions, without additional distributing the QDs into glasses or metal-oxide-frameworks (MOFs). Taking advantage of this effective doping strategy, the Mn2+-doped CsPbCl3 QDs are employed to act as excellent dual-mode luminescent probes towards temperature sensing. The maximum relative sensitivity (SR) reaches as high as 7.38% K-1 and 2.13% K-1 via fluorescence intensity ratio (FIR) and full width at half maximum (FWHM) methods, respectively. The repeatability of luminescence thermometry is distinguished for Mn2+ doped CsPbCl3 QDs as well. It opens an effective strategy to develop nano optical temperature sensing based on perovskite quantum dots.