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Table of Content
23 July 2007, Volume 25 Issue 4
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Third-Order Nonlinear Optical Properties of Croconium Dye for a Kind of Near Infrared Dye Used as Optical Record and Storage Material
LI Zhong-Yu, XU Song, HUANG Xin, ZHANG Fu-shi, Kazuo Kasatani
2007, 25(4): 241-248. DOI:
10.7517/j.issn.1674-0475.2007.04.241
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As a new type of near infrared dye,croconium dyes have drawn much attention for their potential applications in the fields of optical record and storage,and nonlinear optical materials because of their thermal and optical stability as well as intense fluorescence.The third-order optical nonlinearities and responses of a croconium dye(1,3-bis[(3,3-dimethylindolin-2-ylidene)methyl] croconine) in tetrahydrofuran(THF) solution and in poly(methyl methacrylate)(PMMA) coating films were measured using a femtosecond degenerate four-wave mixing(DFWM) technique with a laser pulse of 130 fs system under resonant conditions.The molecular hyperpolarizability,γ of the croconium dye in THF solution was determined to be about 5.3×10
-29
esu,and the third-order nonlinear optical susceptibilities,χ
(3)
of the present PMMA coating films containing the croconium dye was measured to be of the order of 10
-8
esu.Furthermore,the dynamic of DFWM optical response for croconium dye was also studied and analysed.
Preparation of Silver Nanoclusters within PAMAM Template under Ultraviolet Radiation and Their Photoluminescence Efficiency
LI Guo-ping, LUO Yun-jun
2007, 25(4): 249-256. DOI:
10.7517/j.issn.1674-0475.2007.04.249
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The uniform Ag nanoclusters were prepared by using G5.0-OH PAMAM dendrimer as template under ultraviolet radiation.Transmission electron microscopy,UV-Vis absorption and resonance scattering were used to characterize the obtained Ag nanoclusters.The results showed that the size and size distribution of the prepared silver nanoclusters depend on the concentration of PAMAM dendrimers,the molar ratio of silver ions and PAMAM dendrimers and the reaction time.On the basis that the diameter of the obtained Ag nanoclusters is smaller than the calculation diameter of G5.0-OH PAMAM,it could be suggested that G5.0-OH PAMAM dendrimer act as "inner template".Influences of synthesis conditions on the photoluminescence efficiency of Ag nanoclusters were investigated.The PL of Ag nanoclusters is tunable by changing the size of nanoclusters.
Study on the Chromogenic Behaviors of Oxided Anthracyl Bis(indolyl)methane
ZHANG Jun-li, WANG Hua
2007, 25(4): 257-266. DOI:
10.7517/j.issn.1674-0475.2007.04.257
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Two chromogenic compounds,oxided 2-anthracyl bis(indolyl)methane(2-AnBIM) and oxided 9-anthracyl bis(indolyl)methane(9-AnBIM) were synthesized via two steps.The medium factors(polarity,anions and pH) on the absorption behaviors of the two compounds were studied.The difference of UV behaviors in other aprotic solvents is that both 2-AnBIM and 9-AnBIM show strong red shift in CCl
4
.Concentration effect and NMR data show aggregation of titled compounds could be formed at concentration of 1.0×10
-5
mol/L in CCl
4
.In CH
3
CN,2-AnBIM acts as a selective colorimetric sensor only for F
-
,and 9-AnBIM could be sensitive for F
-
,Cl
-
and Ac
-
.Both compounds are sensitive only for HSO
4
-
in CH
3
CN/H
2
O(4/1) system.Both 2-AnBIM and 9-AnBIM show fluorescence emission of intermolecular charge transfer(ITC) state at 77 K.More planarity of 2-AnBIM gives longer wavelength emission and higher quantum yield compared with 9-AnBIM.No obvious emission from 2-AnBIM and 9-AnBIM at room temperature are found,the reason might be from the fast proton transfer at excited state,which decreases the conjugation degree and co-plane of molecules.
Synthesis and Photo-luminescent Properties of PEEK with Blue Light-Emitting
CAI Quan-yuan, MA Juan-juan, LI Xie, TONG Zhi-wei, ZHANG Tian-lin
2007, 25(4): 267-274. DOI:
10.7517/j.issn.1674-0475.2007.04.267
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Novel BOE-PEEK with blue light-emitting had been designed and synthesized by direct nucleophilic substitution reaction of difluoromonomer and 2,6-bis{4-[2-(4-hydroxylphenyl)ethylene]phenylene}benzo[1-2,4-5′]dioxazole as blue light-emitting core,which was prepared through Wittig reaction of 4-hydroxylbenzaldehyde with 2,6-bis(4-chloromethylphenylene)benzo[1-2,4-5′]dioxazole.The chemical structures of BOE-PEEK have been determined by the spectra,GPC,DSC and TGA.The analytic results showed the weight average molecular weight(
M
w
) was 1.38×10
5
,poly-dispersity index(PDI) was 4.35,glass transition temperature(
T
g
) was 195 ℃,beginning to decompose(
T
d
) at 440 ℃.The spectra data of BOE-PEEK gave that UV-Vis absorption λ
max
was 372 nm and photoluminescent λ
max
was 455 nm.When driving voltage was up to 15 V,the device brightness reached 530 cd/cm
2
and EL efficiency was 0.36 cd/A,which was consisted of substrate glass/indium-tin-oxide anode/BOE-PPV(single light-emitting layer)/aluminum cathode.
Research on Polymorph of Copper Phthalocyanine and Preparation of its Ultrafine Particles
LUO Qian, XUE Min-zhao, ZHANG Qing, SHENG Qiao-rong, LIU Yan-gang
2007, 25(4): 275-283. DOI:
10.7517/j.issn.1674-0475.2007.04.275
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In this paper,Copper phthalocyanine(CuPc) was dissolved by Lewis acid complexation-mediated solubilization(LAPS).The mechanism of Lewis acid complexation-mediated solubilization was simply discussed.At the same time,the effect of different solvents to the polymorphism of CuPc was studied.Finally,CuPc ultrafine particles were successfully fabricated by LAPS method combined with microfludics and characterized by dynamic light scattering(DLS),atomic force microscope(AFM) and UV-Vis spectroscopy.
Study of the Photocatalytic Degradation of Rhodamine B on TiO
2
/Clinoptilolite
LI Jing-yi, LIU Li-na, SIQIN Gao-wa, BAI Tu-ya
2007, 25(4): 284-295. DOI:
10.7517/j.issn.1674-0475.2007.04.284
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A series of TiO
2
/clinoptilolite catalysts(different calcination temperature,different particle size and different loading) were prepared.The catalysts can degrade organic dye RhB under UV irradiation.The results show that they have a better catalytic reactivity when the calcination temperature is 500 ℃,the particle size is 180—200 mesh and the authentic mass fraction is 6.18%.It was compared with P25.The results show that its degradation rate is slower than P25:After UV light irradiation of 84 minutes,COD change of P25 is 100%.But after UV light irradiation of 5.5 h,COD change of TiO
2
/clinoptilolite calcinated at 500 ℃ is 71.8%.But TiO
2
/clinoptilolite catalysts are easier to reuse.Because the particle size of P25 is smaller,its sediment rate is slower and it can’t fastly be separated.XRD,TEM,BET,TG-DTA,UV,and Visible diffuse reflectance spectra were employed to characterize these catalysts.The experimental results show that they will have a better photocatalytic reactivity when their BET surface area is bigger.
The Degradation of
p
-Nitrochlorobenzene in Aqueous Solution by TiO
2
/UV/O
2
and TiO
2
/UV/N
2
System
YE Miao-miao, CHEN Zhong-lin, SHEN Ji-min, BEN Yue
2007, 25(4): 296-305. DOI:
10.7517/j.issn.1674-0475.2007.04.296
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The photocatalytic degradation of
p
-nitrochlorobenzene(
p
CNB) was studied using two different catalytic system——TiO
2
/UV/O
2
and TiO
2
/UV/N
2
.The main intermediate products in the two systems were identified and quantified by means of HPLC-MS,the modality of chlorine and nitryl on
p
CNB was studied during the photocatalytic degradation reaction,at last, the hydroxyl radicals in these two different catalytic systems were detected.Results showed that the efficiency of the degradation of
p
CNB in TiO
2
/UV/O
2
system is much better than that of TiO
2
/UV/N
2
system;the hydroxyl radicals was formed in both of the two systems,but the quantity of the hydroxyl radicals is much more than that of TiO
2
/UV/N
2
system;the main intermediate products in TiO
2
/UV/O
2
system is much more than that of TiO
2
/UV/N
2
system,and
p
-nitrophenol(
p
NP),
p
-chlorophenol(
p
CP),5-chlor-2-nitrophenol(5-C-2-PN) were the same intermediate products in both of these two systems;Cl
-
and NO
2
-
were detected in both of these two reaction systems,and NO
3
-
was detected only in the TiO
2
/UV/O
2
system.
Exposure Time Calibration of Digital Still Camera
WANG Yu, LI Ping, WU Hou-ping, LIU Zi-long, FENG Guo-jin, ZHENG Chun-di, ZHANG Qiao-xiang
2007, 25(4): 306-310. DOI:
10.7517/j.issn.1674-0475.2007.04.306
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Exposure time calibration method of digital still camera(DSC) using an integrating sphere uniform source with auxiliary shutter has been discussed in this paper.Influence factors of calibration such as linearity and uniformity of the photosensor and the repeatability of the shutter were analyzed and the calibration results of two digital still cameras were given at the same time.
Progress in Chemical Sensitization of Photothermographic Materials
CAO Jing, LIN Hai-li, YAO Lin-hui, XIA Pei-jie
2007, 25(4): 311-317. DOI:
10.7517/j.issn.1674-0475.2007.04.311
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New advances of chemical sensitization to photothermographic materials in present years were reviewed in this paper.Based on the analysis of references and the author’s experimental results,the viewpoints relating to effective sensitization methods used to raise the sensitivity of PTG materials by raising the outer latent image formation efficiency of silver halide or improving the thermal transiton ability of silver ions donors were brought forward.Finally,some personal proposals about the development of chemical sensitization of PTG materials were introduced as well.
