Hence, the HF-OLED obtained with the T20: MR-T4 combination records an EQE maximum of 32.5%, a FWHM of <30 nm and x/y CIE coordinates chromaticity of 0.13/0.12. Very recently, the Lee group reported an MR-TADF emitter MR-T5, a sterically shielded and rigid emitter based on triptycene-fused B,N core. In doped film, MR-T5 exhibits an emission maximum at 463 nm with a PL of 99%. They have selected a suitable TADF emitter, T21, which effectively sensitizes the emission of MR-T5. The thin film with 20 wt% T21 and 2 wt% MR-T5 with mCBP:DPEPO exhibits a high kFRET of about 4-6×10 7 s -1 . The HF-OLED with T21: MR-T5 showed a maximum EQE of 27.5% and a FWHM of 29nm. Moreover, the Zysman-Colman group reported a new acceptor-free MR-TADF molecule, MR-T6. MR-T6 exhibits weak TADF with a PL of 67% and an emission maximum at 441 nm in 3 wt% PMMA film. The HF device obtained with 35 wt% T22 and 1 wt % MR-T6, reached a maximum EQE of 16.5%, with deep-blue x/y CIE chromaticity coordinates of 0.15/0.11. Recently, same group reported green and red HF-OLEDs based on MR-TADF emitter MR-T7 and MR-T8, respectively. 70 MR-T7 with triphenylamine donor groups showed green emission at 551 nm with FWHM of 58 nm and PL of 93%, while MR-T8 with diphenylamine donor groups showed a red emission at 617 nm with FWHM of 56 nm and PL of 60% in the 2 wt% mCP doped films. A green HF-OLED fabricated using 2 wt% MR-T7 as emitter and 10wt% TADF sensitizer T11, recorded a high maximum EQE of 30 % with x/y CIE chromaticity coordinates of 0.424/0.551. Also, a red HF OLED fabricated using 2wt% MR-T8 as emitter and 10 wt% TADF sensitizer T11 and recorded a high maximum EQE of 18% with x/y CIE chromaticity coordinates of 0.585/0.396 (Table ). There is also increasing interest in designing novel organic-based emitters for the fabrication of white OLED (WOLED). They are developed with low cost and have exhibited notable merits of high efficiency. The WOLED device is characterized by the x/y CIE coordinates of 0.33/0.33. Normally, white light is produced by the simultaneous blue, green, and red missions, or the addition of two complementary emissions. This is usually possible with organic emitters that exhibit dual/multiple/broad emissions. In the case of HF-WOLEDs, the white light is obtained by combining the emissions of both TADF and fluorescence emitters, which covers the complete visible range (400-800 nm). Fig. depicts the co-emission mechanisms of the hyperfluorescent emitters to produce white light emission. Here, the TADF emitter performs a dual role, acting itself as a blue emitter and a sensitizer for fluorescence emitter. A HF-WOLED was developed with T23 as blue TADF emitter, and F5 as a yellow fluorescent emitter. Both T23 and F6 (Figs. and), were co-doped with 0.05% doping concentration, and the HF-WOLED device constructed in DPEPO host exhibits