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) EL spectra of device (a) W1, (b) W2, (c) W3, (d) W4. The unit a.u. is short for arb. units.