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(a) current density-voltage-luminance characteristics of the WOLEDs with thicknesses of CDBP of 2.5, 3.5, 4.0, and 5.0 nm, corresponding to curves 1, 2, 3, and 4. (b) The current efficiency-luminance-power efficiency characteristics. (c) The EQE-luminance characteristics. (d) The EL spectra of the device with 3.5 nm-thick CDBP [125].
