“…On the other hand, the 10 wt% Ir(2‐phq) 3 doped DADBT device also shows outstanding EL performance with EQE, CE and PE at their maximum values of 17.2%, 32.7 cd A −1 and 41.1 lm W −1 , respectively, and they remain to be 16.7%, 31.8 cd A −1 and 33.3 lm W −1 at 100 cd m −2 . Considering the theoretic limits of 5% for fluorescent OLEDs and 20% for phosphorescent OLEDs,5a these performances are among the best for either sky‐blue fluorescent OLEDs,8, 11 or orange phosphorescent OLEDs reported in literatures 2h, 12. These confirm that DADBT is a good blue fluorophor and also an ideal host for orange phosphor.…”