| Organolead trihalide perovskites have attracted great attention due to their brilliant photoelectric properties and ability of been fabricated through solution process, which are widely used in photovoltaic and light-emitting devices. Therefore, deeply understanding the mechanism and the process of luminescence can guide the design of high-performance optoelectronic devices. Here we report the optical properties of solution-processed organolead trihalide perovskite, then reveal the origin of luminescence. Besides, we prepare the MIS-LED of perovskite by combining solution-processed organolead trihalide perovskite with inorganic technology. The primary results are described as follows:(1) Presenting evidences of exciton recombination by studying the excitaton density dependent PL of solution-processed organolead trihalide perovskite films. These evidences include:1) the excellent power-law dependence (I～Lk) of PL intensity on excitation intensity with1<k<2,2) identical peak energy, lineshape as well as linewidth.(2) Proving the exciton localization by the spectral dependence of PL lifetime and further confirming the carrier localization by frequency-dependent THz measurments.(3) By comparing the PL features, both steady-state and time-resolved, in vacuum with that of in ambient air, we reveal that the PL lineshape and decay are sensitive to the ambience. Besides, we describe the PL decay by a model considering the carrier localization, surface band bending, and single-carrier trapping.(5) Designing a new MIS-LED of solution-processed organolead trihalide perovskite with external quantum efficiency of 0.085%. |
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