White organic light-emitting diodes were fabricated by using 4,48-bis （2,28-diphenylvinyl）-1,18-biphenyl （DPVBi） as a dopant with a structure of ITO/4,4′-bis[N-（1-naphthyl-1-）-N-phenyl-amino]-biphenyl （NPB,50...White organic light-emitting diodes were fabricated by using 4,48-bis （2,28-diphenylvinyl）-1,18-biphenyl （DPVBi） as a dopant with a structure of ITO/4,4′-bis[N-（1-naphthyl-1-）-N-phenyl-amino]-biphenyl （NPB,50 nm）/NPB:DPVBi （molecular weight ratio 10∶1,30 nm）/tris-（8-hydroxyquinoline）aluminum（Alq3,20 nm）/LiF（1 nm）/Al.A broad emissive band with four major peaks of 438,464,496 and 520 nm was obtained by electroluminescence spectra,of which 438 nm-,464 nm-and 520 nm-peak come from emission of NPB,DPVBi and Alq3,respectively,and 496 nm-one resulted from the emissive superposition of three materials above.The emission from DPVBi was attributed to the charge trapping from NPB.The emission region was transferred partly from Alq3 to DPVBi-doped NPB by introducing the dopant DPVBi,which leads to emission of DPVBi and an enhanced emission from NPB.The maximum luminance and current efficiency were 4721 cd/m2 at 22 V and 0.80 cd/A at 5V,respectively.展开更多
Formulas of the transfer functions are presented for a series-coupled microring resonant filter and the filtering characteristics of this device are investigated around the central wavelength of 1.55 μm.The simulatio...Formulas of the transfer functions are presented for a series-coupled microring resonant filter and the filtering characteristics of this device are investigated around the central wavelength of 1.55 μm.The simulation results show that when the number of the microring is 4,the amplitude coupling ratio between the channel and the microring is 0.25,that between two microrings is 0.022,and the flat box-like spectral response can be formed.The 3-dB bandwidth is about 0.2 nm,the insertion loss is about 1.5 dB,and the minimum of non-resonant light is close to -150 dB.展开更多
文摘White organic light-emitting diodes were fabricated by using 4,48-bis （2,28-diphenylvinyl）-1,18-biphenyl （DPVBi） as a dopant with a structure of ITO/4,4′-bis[N-（1-naphthyl-1-）-N-phenyl-amino]-biphenyl （NPB,50 nm）/NPB:DPVBi （molecular weight ratio 10∶1,30 nm）/tris-（8-hydroxyquinoline）aluminum（Alq3,20 nm）/LiF（1 nm）/Al.A broad emissive band with four major peaks of 438,464,496 and 520 nm was obtained by electroluminescence spectra,of which 438 nm-,464 nm-and 520 nm-peak come from emission of NPB,DPVBi and Alq3,respectively,and 496 nm-one resulted from the emissive superposition of three materials above.The emission from DPVBi was attributed to the charge trapping from NPB.The emission region was transferred partly from Alq3 to DPVBi-doped NPB by introducing the dopant DPVBi,which leads to emission of DPVBi and an enhanced emission from NPB.The maximum luminance and current efficiency were 4721 cd/m2 at 22 V and 0.80 cd/A at 5V,respectively.
基金Supported by National 863-Projec(2001AA312160) 973-Projec(G2000036604) ,the Chinese Academy of Sciences( One HundredTalent Project)thefoundation of ChangchunInstitute of OpticsFine Mechanics and Physics , Chinese Academy of Sciences(c03Q14z)
文摘Formulas of the transfer functions are presented for a series-coupled microring resonant filter and the filtering characteristics of this device are investigated around the central wavelength of 1.55 μm.The simulation results show that when the number of the microring is 4,the amplitude coupling ratio between the channel and the microring is 0.25,that between two microrings is 0.022,and the flat box-like spectral response can be formed.The 3-dB bandwidth is about 0.2 nm,the insertion loss is about 1.5 dB,and the minimum of non-resonant light is close to -150 dB.
