The doping devices with structure of ITO/NPB/mcp:Zn(4-TfmBTZ)₂/Bphen/LiF/Al a re fabricated,where the Zn(4-TfmBTZ)_2mass fraction in mcp layer is 8% and 50%,r espectively.The results show that the mass fraction of Zn(4-TfmBTZ)_2in mcp layer has important effect on the d evice performance,which contains spectrum and chromaticity.When the Zn(4-TfmBTZ)_2mass fraction is 8%,there ex ists a strong exciplex emission of Zn(4-TfmBTZ)_2and Bphen,while when the Zn(4-TfmBTZ)_2mass fraction is e nhanced to 50%,the exciplex emission almost disappears.The light color is tuned from blue light CIEx,y(0.22,0.27)to white light CIEx,y(0.29,0.34) at the same voltage by changing the Zn(4-TfmBTZ)_2doping amount in mcp layer.