Abstract
Great progress has been made in the all-inorganic perovskite light-emitting device (PeLED) by thermal evaporation. However, the low operational stability of the PeLEDs by thermal evaporation is still a challenge to limit its further practical application. In this work, crown ether was introduced as the interface layer between hole transport layer (HTL) and thermally evaporated CsPbBr3 emissive layer (EML). It is found that the crown ether could not only increase the conductivity of HTL, passivate the nonradiative traps but also control the formation of the insulating Cs4PbBr6 in the EML. Consequently, the current density was evidently improved with increased brightness and current efficiency. More importantly, the working stability was also greatly prolonged due to the suppressed nonradiative defects as well as joule heating. The champion PeLED achieved a turn-on voltage of 2.9 V, a maximum brightness of 15,717 cdm−2, a current efficiency of 3.66 cdA−1, an external quantum efficiency of 1.02%. More importantly, the working lifetime T50 with initial brightness of 100 cd/m2 reached 11.8 h which has prolonged more than 30 times compared with the control devices. Our findings would shed light on revealing the factors to improve operational stability of PeLED devices.
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