Although ITO-based device showed higher initial CE (51.8 cd A−1), its severe efficiency roll-off made the CE reduce to 26 cd A−1at luminance of 9210 cd m−2, while the EQE of ITO-based device also reduced from 14% to 7.2%. Furthermore, the device using optimized Al grids could achieve a max luminance of 27996 cd m−2, much higher than that of ITO-based device which was 9210 cd m−2.