Restraining effect of film thickness on the behaviour of amplified spontaneous emission from methylammonium lead iodide perovskite

Reducing Amplified Spontaneous Emission Threshold in CsPbBr3 Quantum Dot Films by Controlling TiO2 Compact Layer

“…Below the threshold energy densities, PL shows relatively broad emission spectra centered around 520 nm for all samples. At and above the threshold, as reported previously [ 11 ], this broad emission is split into two bands with the emergence of a narrower peak at around 530 nm, which characterizes the ASE state.…”

“…Below the threshold energy densities, PL shows relatively broad emission spectra centered around 520 nm for all samples. At and above the threshold, as reported previously [11], this broad emission is split into two bands with the emergence of a narrower peak at around 530 nm, which characterizes the ASE state. Considering the thickness of the compact layer, it is observed that the intensity evolution of ASE with the pump energy becomes larger as CL thickness increases evidencing the strongly different slope of the PL intensity/energy density curves at various values of CL thickness.…”

“…Then, we need to estimate the number of the absorbed photons, which equals to the number of photons ( ) in the exciting pulse minus the transmitted photons. So [ 11 ], where A is the absorbance where we assume that non-radiative losses are negligible. From , we can estimate the excited carrier density.…”

“…Then, we need to estimate the number of the absorbed photons, which equals to the number of photons (N exc ) in the exciting pulse minus the transmitted photons. So [11],…”

“…By proper cation and anion substitutions, the physical properties of perovskite material can be modified and tuned [4][5][6][7]. The extraordinary success of perovskites materials in solar cells manifest the possibility of extending that to other optical and optoelectronic applications like as active layers in light-emitting diodes (LEDs) and lasers [8][9][10][11][12].…”