Intense Photoluminescence and Strong Stimulated Emission in Microcrystalline CsPbCl₃Films

Enhanced Photoluminescence and Stimulated Emission in CsPbCl3 Nanocrystals at Low Temperature

“…Excitonic superradiance is a cooperative radiation process of a coherently delocalized exciton in a crystal, leading to a very short radiative decay time depending on the coherence length (the extent of the coherently delocalized exciton) . Since the coherently delocalized exciton state is a superposition of all the lowest electronic excited states in individual unit cells of the crystal, this phenomenon has been observed in microcrystalline matter. In the bulk, due to the lattice imperfections and lattice vibrations even at low temperature, such a phenomenon is not observable.…”

“…In the bulk, due to the lattice imperfections and lattice vibrations even at low temperature, such a phenomenon is not observable. In case of very small crystallites (microcrystal), the exciton coherence length is limited , to the size of the crystallite and thus exciton can be coherently delocalized throughout the crystallite.…”

“…Further increase in the size of crystallite will show quenched excitonic superradiance. In large-sized crystallites, weak luminescence has been observed due to dephasing-induced quenching of excitonic superradiance. The main cause of the dephasing in the excitonic superradiance may be exciton–phonon scattering rather than lattice imperfections in the microcrystals.…”

Energy transfer yellow light emitting diodes based on blends of quasi-2D perovskites

“…33 As a result, all energy observed was being transferred from the high energy states to the lowest, by virtue of Forster like energy transfer, where superradiance effects certainly must be taken into account as these link the excitonic wave functions along with the radiation field. 44,45 However, in this previous total energy transfer observation, the materials had been literally grinded together to form a set of well split and adjoined quantum entities.…”

Luminescence and scintillation properties of La- and La,Ag-doped CsPbCl3 single crystals

“…7) Several reports have been published on the photoluminescence (PL) of CsPbCl 3 single crystals [8][9][10][11][12][13] and polycrystalline films. [14][15][16][17][18][19][20][21] In addition to the bulk crystalline state, interesting PL properties have been reported for CsPbCl 3 nanocrystalline forms. [22][23][24][25][26][27][28][29][30][31][32][33] One noticeable feature of the PL of nanocrystals is their stronger free exciton emission than that of bulk crystals.…”