A stable red organic light-emitting device has been realized by doping a red dye tetra-methyljuloidine(DCJT)in electron transporting layer(ETL).The structure of the device was ITO/ CuPc/ NPB/ Alq: DCJT/ MgAg

where copper phthalocyanine(CuPc)was used as a buffer layer

N

N ’-his-(1-napthyl)-N

N’-diphenyl-1

1’-biphenyl-4

4’-diamine(NPB)as the hole transporting layer

tris(8-quinolinolato)aluminum complex(Alq)as ETL

in which DCJT was doped

indium tin oxide(ITO)and MgAg were as the anode and cathode

respectively.The red emission with peak at 620nm and CIE coordinates

x

=0.63

y

=0.37

maximum luminance 4687cd/m

2

maximum luminous efficency 0.83lm/W were obtained.The device showed a high stability under 12mA/cm

2

current density continuous operation

the half decay time reached 2 500 hours at the initial luminance 150cd/m

2

and the change of driving voltage was 0.6mV/hour in the degradation process.If 50cd/m

2

is taken as the initial luminance of red device

the half decay time is considered to be 7500 hours.(According to European Broadcasting Union(EBU)standard

for color display the ratios for red

green

blue luminance should be 30%

59% and 11%

respectively

since 100cd/m

2

is often used as initial luminance of green emission in degradation test

50cd/m

2

should be adapted as the initial luminance for red emission.)