By mean of subpicosecond pulsed excitation of excitons, we have measured the photoluminescence spectra of (C6 H5 C2 H4 N H3) 2 Pb I4 under a high-excitation regime up to 4× 1014 photons cm2. At 10 K, two additional lines are observed below the exciton energy by 55 and 75 meV for excitation greater than 2× 1013 photons cm2. The former is assigned to the amplified spontaneous emission of the excitonic molecule. The latter is presumed to be the emission of a triexciton leaving two excitons behind, because the intensity is proportional to the 2.6 power of the excitation intensity. An elementary model of the triexciton is presented. The dissociation energy of a triexciton is estimated to be 14 meV from the temperature dependence.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2006 Oct 31|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics