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) EL spectra of device W5 at various biases. (b) J–V–L characteristics of devices W2 and W5. (c) PE–J–CE characteristics of the devices W2 and W5. (d) EQE–J characteristics of the devices W2 and W5.