Abstract
By using typical luminescent materials,4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl(DPVBi) and 5,6,11,12-tetraphenylnaphthacene(Rubrene) as a blue and orange emitter,respectively,a highly efficient bright nondoped white electroluminescent device with low driving voltage and ideal chromaticity is fabricated.The turn-on voltage,maximum current efficiency are 3.1 V,6.7 cd/A(luminous efficacy of 5.5 lm/W,external quantum efficiency of 2.8%),respectively.Commission Internationale de l'Eclairage(CIE) co-ordinates are at ideal equal-energy white point(0.33,0.33).The achievement of excellent white emission is attributed to realizing perfect ratio of energy transfer from DPVBi to Rubrene by tuning distance from NPB/DPVBi interface to Rubrene.
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