Table of Content

20 February 2001, Volume 19 Issue 1

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ELECTRODEPOSITION OF CuInSe₂ THIN FILMS

SHEN Cheng-min, ZHANG Xiao-gang, LI Hu-lin

2001, 19(1):  1-8.  DOI: 10.7517/j.issn.1674-0475.2001.01.1

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CuInSe₂ films were deposited by potentiostatic on Ti electrode in the solution containing CuSO₄, SeO₂, In₂(SO₄)₃ at pH=1.35. Deposition potential ranges were determined by linear sweep method. SEM indicated that uniform and compact films were obtained after complexing agents were added. XRD showed that the CuInSe₂ films consisted of chalcopyrite phase and sphalerite phase and the intensity of diffraction peaks increased when complexing agents exist. Particle size of the films is about 250 nm and could be explained by the fact that each grain observed under the microscope is a cluster of submicroscopic crystallites.

SYNTHESES AND ELECTROLUMINESCENT PROPERTIES OF CYANO SUBSTITUTED N,N'-DIPHENLYSTYRYLANILINE

WANG Wei, XUE Min-zhao, LIU Yan-gang

2001, 19(1):  9-12.  DOI: 10.7517/j.issn.1674-0475.2001.01.9

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Two cyano-substituted N,N’-diphenylstyrylanilines were synthesized, which incorporated both hole-transport group(triphenylamine substituent) and electron withdrawing group(cyano substituent). Study showed that cyano substituent lowerd the HOMO and LUMO energies and increased the electron affinity of molecules, thus improved the efficiency of electron injection and potential efficiency of molecules. EL device fabricated with these molecules showed good stability and low onset voltage.

PHOTOCHEMICAL PREPARATION OF GREEN SILVER AND YELLOW SILVER COLLOID AND THEIR RESONANCE SCATTERING SPECTROSCOPIC STUDY

ZHONG Fu-xin, JIANG Zhi-liang, LI Ting-sheng, LI Fang, LIANG Hong

2001, 19(1):  13-18.  DOI: 10.7517/j.issn.1674-0475.2001.01.13

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The green silver colloid and yellow silver colloid were prepared by two-step photochemical procedure and UV photochemical procedure respectively. Their sizes measured by TEM are 100 nm and 40 nm respectively. The green silver solloid exhibits two absorption peaks at 393.9 nm and 713.3 nm , The absorption peak of yellow silver colloid is at 419.3 nm. They have a maxium resonance scattering peak at 470 nm, and the green silver colloid has other two resonance scattering peaks at 340 nm and 680 nm.

THE INTERACTION MECHANISM OF METHIONINE AND CHEMICAL SENSITIZERS

ZHANG Yi-heng, FENG Shao-hong, GONG Zhu fang 1, YAN Tian-tang, YU Shu-qin 2 (Department of Applied Chemistry, 1 Department of Modern Physics, 2 Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R.

2001, 19(1):  19-28.  DOI: 10.7517/j.issn.1674-0475.2001.01.19

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The changes of the chemical states and the relative contents of sulfur, gold, carbon and oxygen after methionine reacted with different chemical sensitizers are studied by ESCA scanning technique of X-ray Photoelectron Spectroscopy(CPS). The results indicated that the interaction mechanism of methionine reacted with different chemical sensitizers is not identical. Any oxidation-reduction reaction did not occurred between methionine and sulfur sensitizer, they could coexist steadily in the same system. The methionine was oxidized to methionine sulfoxide, in the same time reducing Au³⁺ to gold atom. The hydroxy of methionine could coordinate Au, forming Au-O-C coordinate metal complex. After S⁺Au sensitizers had been immersed into methionine system, oxidation-reduction reaction occurred between added thiosulfate and Au³⁺, methionine could coordinate Au which was reduced by sulfur sensitizer, also forming Au-O-C coordinate metal complex.

THE SPECTRAL CHARACTERISTICS AND QUANTUM YIELDS OF ACID SENSITIVE COLOR-CHANGING RECORDING MATERIALS

YU Hui, JIN Zhong, CHI Cheng-lin, ZHANG Qi-chun, DI Zhen-wen, WANG Yan-qiao

2001, 19(1):  29-34.  DOI: 10.7517/j.issn.1674-0475.2001.01.29

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The spectral characteristics and photolysis quantum yields of ACRM composed of vinylidene chloride-methyl acrylate(VdCl₂-MA) copolymer and pentamethoxyl red were measured. By adding photosensitizer MK, the ACRM that can not only be photolyzed by exposure at 254 nm UV light but can be photolyzed by exposure at 365 nm UV light. The quantum yields of ACRM without photosensitizer at 254 nm is 0.032-0.020, and the quantum yield of ACRM with photosensitizer at 365 nm is 0.11-0.034. The quantum yields of ACRM with photosensitizer is improved by 2-4 times.

THE GELATIN WITH THE HIGHEST α₁ CONTENT

WANG Ying, CHEN Li-juan, PENG Bi-xian

2001, 19(1):  35-38.  DOI: 10.7517/j.issn.1674-0475.2001.01.35

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Isinglass is a kind of gelatin made from fish swim bladder and can be used in many fields,which introduces the new study of isinglass. A few fish gelatin samples were prepared by enzymatic method. SDS-PAGE method indicates the content of α₁ conformations of isinglass, which was made from swim bladder. The capacity is above 50%, which is much higher than that of bone processed. Concentration of α₁ gelatin is much higher than the international IAG gelatins. In view of the decisive effect on gel strength of gelatin.This discovery has an important significance for expanding the applications of isinglass.

SYNTHESIS AND PROPERTIES OF A 1,5-NAPHTHYLENEDIAMINE DERIVATIVE AS A NEW ORGANIC ELECTROLUMINESCENT MATERIAL

LI Ruo-hua, QIAO Juan, QIU Yong, HU Qing-yu

2001, 19(1):  39-42.  DOI: 10.7517/j.issn.1674-0475.2001.01.39

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A new hole transporting material, 1,5-bis[N-(1-naphthy)-N-phenyl]naphthalene diamine (NPN), was synthesized. The absorption and emission spectra were determined. The amine showed exceedingly high T_g’s(127 ℃) or thermal stability as well as low ionization potential(I_p, 5.30 eV), so that being expectable as a new candidate for hole injection and/or transport material in organic light emitting diodes.

SYNTHESIS OF p-DIPHENYLAMINO BENZALDEHYDE DIPHENYLHYDRAZONE AND STUDY ON ITS PHOTOCONDUCTIVE CHARACTERISTIC

CHI Chen-lin, DING Rui-song, ZHANG Qi-chun, JIANG Ke-jian, YANG Lian-ming, WANG Yan-qiao

2001, 19(1):  43-47.  DOI: 10.7517/j.issn.1674-0475.2001.01.43

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p-diphenylamino benzaldehyde diphenylhydrazone was synthesized.The compound was characterized by a series of ways.We also prepared the photoconductive device using the compound and TiOPc. As a result,the compound shows good photoconductivity (E_1/2=1.0 lx.s).Electric potential of redox suggests that the compound matches TiOPc well.

ANALYSIS OF EFFICIENCY OF IMAGE FORMATION AND PREDICTION OF FUTURE OF COLOR FILM AND DIGITAL STILL CAMERA

Tadaaki Tani

2001, 19(1):  48-71.  DOI: 10.7517/j.issn.1674-0475.2001.01.48

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The present author has ever predicted the future of silver halide photographic materials by evaluating the distance between the present state and theoretical limit of the efficiency of image formation and analyzing the causes for it. This paper describes the result of the application of the above stated method to color films and digital still cameras at the present. It was predicted that the room for the improvement of the efficiency of image formation of the former would be much larger than that of the latter in the future,and that the former will continue to lead photography.

NEW TYPES OF DOPANTS IN SILVER HALIDE EMULSIONS

DAI Hui, LIANG Bing, ZHUANG Si-yong

2001, 19(1):  72-78.  DOI: 10.7517/j.issn.1674-0475.2001.01.72

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Two new types of dopants are introduced in this paper. One type is a transition metal complex dopant which can create shallow electron traps in silver halide grains. The other is a carboxylate organic compound which can create hole traps in the silver halide grains. Both types of traps can effectively prevent the photoelectrons and the holes from recombination and hence increase the efficiency of the latent image formation, resulting in significant increase of the sensitivity of the photographic emulsions. The principles of selecting dopants are presented. Some experimental results in patents are provided to illustrate the effects of dopants on the photographic properties of the silver halide emulsion.