Highly Efficient Self-Trapped Exciton Emission of a (MA)<sub>4</sub>Cu<sub>2</sub>Br<sub>6</sub> Single Crystal
Hui Peng, Shangfei Yao, Yongchang Guo, Ruonan Zhi, Xinxin Wang, Fujian Ge, Ye Tian, Jianping Wang, Bingsuo Zou
Abstract
was proven by density functional theory calculation, and its band gap was determined by experiments to be ∼3.87 eV. In the temperature range of 98-258 K, the PL intensity increases gradually with an increase in temperature due to the deep trapping out of strong electro-phonon coupling, while the PL decreases when the temperature increases over 258 K due to phonon scattering. It is worth mentioning that this new material has high chemical and light stability, in contrast to the lead perovskite.
Topics & Concepts
PhotoluminescenceExcitonMaterials sciencePerovskite (structure)Single crystalQuantum yieldBand gapCrystal (programming language)Stokes shiftCondensed matter physicsMolecular physicsLuminescenceOptoelectronicsOpticsCrystallographyChemistryFluorescencePhysicsComputer scienceProgramming languagePerovskite Materials and ApplicationsSolid-state spectroscopy and crystallography2D Materials and Applications