Perovskite Nanomaterials as Advanced Optical Sensor

Perovskite quantum dots (PeQDs) with ultra-small crystal size of a few nanometers are a unique class of luminescent materials having excellent optical properties including narrow and bright emission, color purity, tunable emission, defect tolerance capacity, and very high photoluminescence quantum yield. The physical and chemical nature of perovskite nanocrystals changes with various environmental variables like temperature, moisture, gases, solvents, etc. All these unique features of PeQDs have allowed them to serve as ideal probes for a variety of sensing applications. Among various sensing methods, optical sensing is one of the promising sensing methods due to its simplicity, effective, and low-cost method which occurs via electron transfer, FRET, and ion exchange mechanism. Here, in this chapter, we have discussed various preparation methods of perovskite nanomaterials and their optical sensing mechanism along with their applications which explains the reason why these nanomaterials are been widely used as sensing materials. Although PeQDs are one of the most preferred sensing materials, it has their own limitations which have been discussed in the conclusion section along with their remedies.