Organic-inorganic hybrid perovskites (OIHP) are promising materials for high efficiency light emitting diode (LEDs) due to their high color purity, their high photo-luminescence quantum yield and their bandgap tuneability. Introducing long chain ammonium halide in a perovskite films can result in energy funneling from a distribution of two-dimensional perovskite nanosheets to three-dimensional nanocrystals through energy cascade from high bandgap energy states (nanosheets) to lower bandgap energy states (nanocrystals), or enhance the passivation of the 3D nanocrystals. Thus, the electrical charge injection in the emitter site is enhanced or the non-radiative recombination rate is reduced. Here we report on the doping of a FAPbBr₃ green-emitter with n-BABr (butyl ammonium bromide). Upon addition of a small amount of n-BABr (0.2 wt%) in a non-stoichiometric perovskite solution, the photoluminescence intensity of thin films and current efficiency of PeLEDs increase by about an order of magnitude, from 1.2 Cd/A without to 13.5 Cd/A with n-BABr doping.

有机-无机杂化钙钛矿（OIHP）由于其高色纯度，高光致发光量子产率和带隙可调谐性而成为高效发光二极管（LED）的有前途的材料。在钙钛矿薄膜中引入长链卤化铵会导致能量漏斗，从二维钙钛矿纳米片到三维纳米晶体的分布通过从高带隙能态（纳米片）到低带隙能态（纳米晶体）的能量级联，或增强3D纳米晶体的钝化。因此，增强了在发射极部位的电荷注入或降低了非辐射复合率。在这里我们报告了FAPbBr ₃的掺杂n-BABr（丁基溴化铵）的绿色发射体。在非化学计量的钙钛矿溶液中添加少量的n-BABr（0.2 wt％）后，薄膜的光致发光强度和PeLED的电流效率从1.2 Cd / A（不增加到13.5）增加了大约一个数量级。具有n-BABr掺杂的Cd / A。