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By integrating PyI with anthracene, two high-efficiency blue emitters C-BPyIA and N-BPyIA are obtained. Especially, N-BPyIA exhibits decent device performance with an EQEmax of 7.67% in the deep blue region.

Organic light-emitting diodes (OLEDs) have been greatly developed in recent years owing to their abundant advantages for full-color displays and general-purposel ightings. Blue emitters not only provide one of the primary colors of the RGB (red, green and blue) display system to reduce the powerc onsumption of OLEDs, but are able able to generate light of all colors, includingb lue, green, red, and white by energy transfer processes in devices. However,i t remains ac hallenge to achieve high-performance blue electroluminescence, especially for nondoped devices.I nt his paper,w ereportablue light emitting molecule, DPAC-AnPCN, which consists of 9,9-diphenyl-9,10-dihydroacridine and p-benzonitrile substituted anthracenem oieties. The asymmetrically decoration on anthracene with different groups on its 9a nd 10 positions combines the merits of the respective constructingu nits and endows DPAC-AnPCN with pure blue emission, high solid-statee fficiency,g ood thermal stabilitya nd appropriate HOMO and LUMO energy levels. Furthermore, DPAC-AnPCN can be appliedi nanondoped device to effectively reduce the fabrication complexity and cost. The nondoped device exhibits pure blue electroluminescence( EL) locating at 464 nm with CIE coordinates of (0.15, 0.15). Moreover, it maintains high efficiency at relatively high luminescence. The maximum externalq uantum efficiency (EQE) reaches 6.04 %a nd still remains 5.31% at the luminanceo f1 000 cd m À2 showing av ery small efficiency roll-off.

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