In the experimentation

the blue OLED with 9

10-di-(2-naphthyl) anthracene (ADN)as light-emitting subjectivalization was fabricated. It is found that the performances of devices are effected by the thickness of AND.When the ratio of AND/Alq

3

thickness is 4 : 3

and the thickness of AND is 40 nm

the open voltage of devices is lower and the characteristic of luminescence is improved. In addition

when the TBP is doped in devices

the energy level structure is changed. For this reason the efficiency of electronic injection is improved and hole export keeps off state.So the recombination rate of exciton is improved.It is also found that scale of the TBP doping has a best level.When the scale level is 2%

the characteristic of luminescence and color purity quotient of the devices are best.