Whispering gallery mode micro-lasing in CsPbI quantum dots coated on TiO microspherical resonating cavities.

Whispering gallery mode (WGM) lasing in CsPbI quantum dots (QDs) coated on TiO spherical microcavities is demonstrated. The photoluminescence emission from a CsPbI-QDs gain medium strongly couples with a TiO microspherical resonating optical cavity. Spontaneous emission in these microcavities switches to a stimulated emission above a distinct threshold point of 708.