Enhancement of Förster energy transfer from thermally activated delayed fluorophores layer to ultrathin phosphor layer for high color stability in non-doped hybrid white organic light-emitting devices

Wang Zijun¹, Zhao Juan^{2, ‡}, Zhou Chang¹, Qi Yige¹, Yu Junsheng^{1, ‡}

(color online) (a) Current density–voltage–luminance (J–V–L) characteristics of devices W1–W4. (b) Power efficiency–current density–current efficiency (PE–J–CE) characteristics of the devices W1–W4. (c) External quantum efficiency–current density (EQE–J) characteristics of the devices W1–W4.