Organic light emitting devices (OLED) has gained a rapid development recently. It is technically crucial in the field of plate panel displays in the future. The most important superiority of OLED is that it can realize flexible displays-flexible organic light emitting devices(FOLED). White light

which is composed of three discrete peaks in R/G/B regions

is very important and particularly useful for full-color display. However

most of white OLEDs

so far

are fabricated with multilayer structures

which results in the complication of fabrication process and decline of quantum efficiency. So these devices are not suitable for the purpose of large-scale industrial manufacture.Bis-2-(2-hydroxyphenyl)benzothiazolate zinc (Zn(BTZ)

2

) is one of the best organic electroluminescent materials used for white light-emitting devices (OLED). PET slice with ITO is used as substrate of FOLED. We use Zn(BTZ)

2

as main light-emitting material and fabricate a new type of flexible organic white-light-emitting devices. The configurations of the devices are as follows:PET/ITO/PVK:TPD/Zn(BTZ)

2

/Al. The bright and steady light emitting has been obtained

and the brightness of the devices comes to 1000 cd/m

2

(at a driving voltage of 25 V). We also measure the CIE coordinates of the above devices

which are (

x

=0.242

y

=0.359)

and corresponding quantum efficiency value is 0.30%. Then the Rubrene is doped in Zn(BTZ)

2

and the configurations of this devices are as follows:PET/ITO/PVK:TPD/Zn(BTZ)

2

/Al and ITO/PVK:TPD/Zn(BTZ)

2

:Rubrene/Al. The brightness of the devices comes to 1200 cd/m

2

(at a driving voltage of 25 V)

and the CIE coordinates of the above devices are (

x

=0.339

y

=0.339)

and corresponding quantum efficiency value is 0.35%. Details on the white-light-emitting characteristics of the devices are explained by the diagram of current density-voltage

optical current-voltage and quantum efficiency-current density

which are measured using Keithley 485 Picoammeter and 2400 SourceMeter. Last

we also discuss the emitting mechanism of the material and the devices.