Device W2 also shows obvious CP-EL signals in a wide region from 380 to 780 nm with gEL values of -3.26 × 10 -3 @434 nm, -3.86 × 10 -3 @510 nm and -2.92 × 10 -3 @610 nm, and the CP-EL signal in blue region is also strengthened to some degree relative to that of device W1 (Fig. ). The achiral TcTa layer in device W2 functions as exciton-and electron-blocking layer between chiral deep-blue layer and achiral green layer, leading to enhanced exciton recombination in chiral deep-blue layer, and thus increased signals in both EL and CP-EL spectra. Since the achiral green BDMAC-XT layer is located adjacent to the achiral TcTa layer, then to the chiral deep-blue (S)-PCNTPA layer, the observed green CP-EL signal should not be caused by the chiral environment induced by the chiral blue (S)-PCNTPA layer. Furthermore, the achiral red DBP layer is situated next to the achiral green BDMAC-XT layer in device W2, namely it also has zero contact with the chiral deep-blue (S)-PCNTPA layer. Therefore, the observed red CP-EL signal should be attributed to the spin-polarized excitons rather than the chiral environment as well. These findings provide further evidences for that spin-polarized charge carriers are acquired when current passes through the chiral (S)-PCNTPA layer, and then are transported into achiral green and red layers to form spin-polarized excitons, ultimately furnishing green and red CP-EL signals (Fig. ).