In this case, the triplet excitons transfer from fluorophor to phosphor while the singlet excitons are confined and used for fluorescence, as illustrated in Fig. 8. We doped 0.3% Ir(ppy)2(acac) in Bepp2 and obtained a primary color emission in the hybrid WOLED. The efficiencies and spectra are shown in Fig. 9. The power efficiency and EQE were 23.0 lm/W and 11.9% at 1000 cd/m2, respectively. The spectra in this hybrid WOLED were very stable, and the CRI reached as high as 90 and the CIE stayed at (0.42, 0.44).