The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers i...The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers in organic light-emitting devices (OLED) have been investigated. The NPB and Alq3 layers were prepared using thermal evaporation method. The results show that the energy band gap of Alq3 is thickness independence while the energy band gap of NPB decreases with the increasing of sample thickness. For the case of photoluminescence the Alq3 with thickness of 84 nm shows the highest relative intensity peak at 510 nm.展开更多
N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination of chromium in original matrix of liquid oils.The method is based on the complexation of N,N'-bis(4...N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination of chromium in original matrix of liquid oils.The method is based on the complexation of N,N'-bis(4-methoxysalicylidene)ethylenediamine and chromium in n-hexane∶acetone(1∶4)medium and spectrophotometric determination at 355 nm against reagent blank.Complexation of MSE and chromium is completed in20 seconds at molar ratio 1∶1.The molar absorptivity and the formation constant of the complex are determined as 9 740L·mol^(-1)·cm^(-1) and 3.6(±0.1)×10~5,respectively.Beer's law is obeyed in range 0.02~1.50mg·L^(-1) chromium concentration.Limits of detection and quantification of the suggested method were7.5 and 25.11μg·kg-,respectively.The accuracy and precision of the method was checked by finding mean recovery and relative standard deviation by oil-based chromium standard analysis as 96.4%±1.4%and 1.5%,respectively.The practical applicability of elaborate method was tested using oil-based chromium standard spiked and unspiked corn,sunflower,soybean,olive and canola oils.展开更多
The steady state and transient state absorption spectra and fluorescence spectra of N,N’-bis(2-hy-droxy-1-napbthylidcne)-1,4-phenyldiamme ( BNP ) in cyclohexane and acetonitrile were determined.The pho-tochromic mech...The steady state and transient state absorption spectra and fluorescence spectra of N,N’-bis(2-hy-droxy-1-napbthylidcne)-1,4-phenyldiamme ( BNP ) in cyclohexane and acetonitrile were determined.The pho-tochromic mechanism was discussed In nonpolar solvents,BNP exists mainly in the enol form and has the absorption maximum in the UV region In polar solvents,however,both the enol and proton transfer tautomer are formed,but the farmer is the main one Fluorescence emissions result from the excited state of proton transfer product.展开更多
文摘The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers in organic light-emitting devices (OLED) have been investigated. The NPB and Alq3 layers were prepared using thermal evaporation method. The results show that the energy band gap of Alq3 is thickness independence while the energy band gap of NPB decreases with the increasing of sample thickness. For the case of photoluminescence the Alq3 with thickness of 84 nm shows the highest relative intensity peak at 510 nm.
基金the Scientific and Technological Research Council of Turkey(TUBITAK-TBAG project number 105T153)
文摘N,N'-bis(4-methoxysalicylidene)ethylenediamine is proposed as analytical reagent for the direct determination of chromium in original matrix of liquid oils.The method is based on the complexation of N,N'-bis(4-methoxysalicylidene)ethylenediamine and chromium in n-hexane∶acetone(1∶4)medium and spectrophotometric determination at 355 nm against reagent blank.Complexation of MSE and chromium is completed in20 seconds at molar ratio 1∶1.The molar absorptivity and the formation constant of the complex are determined as 9 740L·mol^(-1)·cm^(-1) and 3.6(±0.1)×10~5,respectively.Beer's law is obeyed in range 0.02~1.50mg·L^(-1) chromium concentration.Limits of detection and quantification of the suggested method were7.5 and 25.11μg·kg-,respectively.The accuracy and precision of the method was checked by finding mean recovery and relative standard deviation by oil-based chromium standard analysis as 96.4%±1.4%and 1.5%,respectively.The practical applicability of elaborate method was tested using oil-based chromium standard spiked and unspiked corn,sunflower,soybean,olive and canola oils.
基金Project supported by the National Natural Science Foundation of Chinathe Foundation of Chinese Academy of Sciences
文摘The steady state and transient state absorption spectra and fluorescence spectra of N,N’-bis(2-hy-droxy-1-napbthylidcne)-1,4-phenyldiamme ( BNP ) in cyclohexane and acetonitrile were determined.The pho-tochromic mechanism was discussed In nonpolar solvents,BNP exists mainly in the enol form and has the absorption maximum in the UV region In polar solvents,however,both the enol and proton transfer tautomer are formed,but the farmer is the main one Fluorescence emissions result from the excited state of proton transfer product.
