“…This also leads to the spectral shift of the photoluminescence bands [19]. To the moment, several host materials were proposed for PbS QD synthesis, including solid glass matrices (phosphate [13], silicate [12], boro-silicate [20]), polymers [21,22], organic and water solutions [23,24], sol-gel thin films [25,26]. Thus, the number of potential applications for PbS QD-doped structures is expanding: they were used as saturable absorbers for passive mode-locking and Qswitching if near-IR lasers [8,[27][28][29], luminescent marks [30], fiber amplifiers [10], in solar cells and photovoltaics [9,31].…”