Optical thermometry of Sm 3+ on laser‐induced local heating for precipitation of PbS quantum dots in glasses

Fluorescence intensity ratios ( FIR s) of the 640 nm and 602 nm emissions from Sm 3+ were recorded at various temperatures T to identify the temperature increases Δ T associated with laser‐induced local heating of Ag nanoparticles. The FIR s increased as intensities of the excitation beam from a 532‐nm continuous‐wave laser increased. Estimated T of the irradiated region increased to as high as 586°C when at laser irradiation of 1.5 W on the surface containing Ag nanoparticles. Local heating due to the surface plasmon resonance of Ag nanoparticles is a main reason for the Δ T that eventually leads to precipitation of PbS quantum dots in glasses.