A new emission model of organic light-emitting diode (OLED) based on triplet-triplet annihilation upconversion (TTAUC) with a high intrinsic upconversion efficiency (86.1) by using tris-(8-hydroxyquinoline)aluminum (Alq3)9,10-Bis(2-naphthyl)anthracene (ADN) as green sensitizerblue emitter, respectively. This structure improved the device efficiencyoperation lifetime compared to the conventional TTA-OLEDs. A record-high efficiency of 15.4EQEa 1.5x lifetime performance comparing to the commercial blue OLED are obtained by utilizing the TTAUC mechanism.