A thin layer of NaCl with a thickness of "~ 3 nm" was deposited on 15 nm ZnO NP+PEIE/ 80 nm SY in an OLED stack. A super thin layer of NaCl acts as a surface modifier increasing the electron injection, current density, external quantum efficiency and finally the overall performance of the OLED. The optical, electrical and morphological properties of OLEDs are enhanced by both solution-processed and vacuum-processed NaCl deposition. Significant enhancement in the EQE and illuminance of the NaCl-based device were exhibited compared with standard devices and are allowed to use because of their abundant availability and nontoxicity for efficient OLEDs.
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