The A-D-A compound DIDOBNA-N also presented a highly desirable set of photophysical properties in TSPO1. Using the same device structure as that of MesDIDOBNA-N, the OLED with DIDOBNA-N showed deep-blue unstructured EL (lEL = 429 nm, FWHM = 70 nm, CIE = 0.152, 0.073) at cD of 1.5 wt% (Figure ), which corresponds well to the NTSC standard of (0.14, 0.08) for blue emission. Interestingly, The peak of the EL of DIDOBNA-N at 429 nm is close to the PL peak in dilute THF solutions (426 nm), although the EL spectrum is broader. The Von was 4.2 V, and the EQEmax was high at 15.2%, which decreased to 3.8% at 100 cd m -2 . Like the MesB-DIDOBNA-N OLED, the DIDOBNA-N device is among the most efficient devices at this λEL (Figure and Table ).