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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