Besides blue HF-OLEDs, there were a few efforts to develop other (green, red, and white) HF-OLEDs (Table ). In detail, an efficient green HF-OLED fabricated using TADF emitter T11, fluorescence emitters F7 and F8 with mCP host (Figs. ). The EQEs were 13.5% and 14.6% for T11:F7 and T11:F8 couple emitter, respectively. Here, it could be noted that, EQE of only ~5% was obtained using the traditional Alq3 host with TADF emitter T11 and fluorescence emitters F7 and F8. This indicates the crucial role of the host towards high EQEs. Yellow HF-OLEDs with the TADF emitter T12 and yellow emitting fluorescence emitter F5 (Figs. and), which feature a good overlap of the emission spectrum of T12 with the absorption spectrum of F5, featured a maximum EQE of 19.1% using the mCBP host. Finally, red HF-OLEDs were prepared mixing T13 or T14 with F6 and CBP host. The device composed of T13:F6 exhibited a maximum EQE of 8 % and x/y CIE chromaticity coordinates of 0.61/0.38.