Metal halide Perovskite Light-Emitting Diodes (PeLEDs) rapidly advance in their External Quantum Efficiency (EQE), highest brightness, and operation lifetime in recent years. However, solution-processed PeLEDs usually encounter uniformity issues of crystal growth, which make them difficult to realize large-area fabrication, despite their outstanding device performance. With the intrinsic advantage of high reproducibility and uniformity in thin-film quality, vacuum-deposited PeLEDs possess a great potential in industrial mass production. Although breakthroughs have been observed in vacuum-deposited PeLEDs recently, the strategy of choosing their Hole-Transport Materials (HTMs) still follows the experience of solution-processed PeLEDs. In this work, we demonstrated a simple approach to significantly improve vacuum-deposited perovskite PeLEDs by inserting a thin vacuum-deposited interfacial organic layer between 1,1-Bis[(di-4-tolylamino) phenyl] cyclohexane (TAPC) HTM and perovskite emission layer (EML). With the evidence of X-ray Photoelectron Spectroscopy (XPS), we showed that the interfacial layer successfully inhibited the formation of metallic Pb0 caused by the TAPC/perovskite chemical degradation. The device with the interfacial layer exhibited a luminance of 55968 cd m-2, a current efficiency of 33.2 cd A-1, and an EQE of 9.40%, which was a 4-fold enhancement compared to that of the device without the interfacial layer. The results of EQE and brightness are among the highest reported values in vacuum deposited PeLEDs.
In this work, we prepared chemical bonding polyimide (PI)-silica hybrid films as the light extraction layers for organic light-emitting diodes using 3-aminopropyltriethoxysilane (APTES) as coupling agent followed by sol-gel and thermal imidization process. Being benefited by the chemical bonding, homogeneous dispersion of silica was achieved to realized high optical transparent and low-hazed hybrid films. The hybrid films also exhibited high thermal stability with the Td (5 % weight loss temperature) of 507 oC. The hybrid films efficiently enhanced the efficiency of organic light-emitting diodes with maximum external quantum efficiency (EQE) of 23.5%, exhibiting an enhancement of 15% compared with the reference devices without the hybrid films.
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