Recently, perovskite light-emitting diodes (PeLEDs) have drew widespread attention due to their high efficiencies.However, because of the sensitivity to moisture and oxygen, perovskite luminescent layers are usually prepared in high-purity nitrogen environment, which increases the cost and process complexity of device preparation and seriously hindrances its commercialization of PeLED in lighting and display application.Herein, dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 films are fabricated from CsBr-rich perovskite solutions by a simple one-step spin-coating method in the air with high Fridge Door Handle Cover humidity.Compared with the pure CsPbBr3 film, the composite CsPbBr3-Cs4PbBr6 film has much stronger photoluminescence emission and longer fluorescence lifetime, accompanied by increased photoluminescence quantum yield (33%).
As a result, we obtained green PeLED devices without hole transport layer exhibiting a Quilted Padded Shirts maximum brightness of 72,082 cd/m2 and a maximum external quantum efficiency of about 2.45%, respectively.More importantly, the champion device shows excellent stability with operational half-lifetime exceeding 1,000 min under continuous operation in the air.The dual-phase all-inorganic composite CsPbBr3-Cs4PbBr6 film shows attractive prospect for advanced light emission applications.