Optical studies of phthalocyanine molecules in PVA film (original) (raw)

Optical properties of phthalocyanine molecules in cyano acrylate polymer matrix

Materials Research Bulletin, 2001

Optical absorption and emission spectral studies of various phthalocyanine molecules, viz., LaPc, NdPc, SmPc, EuPc, CuPc and ZnPc in a polymer matrix of cyano acrylate are reported for the first time. All the absorption spectra show an intense B band (Soret) in the UV region followed by a weaker Q band in the visible region. The positions of the Q and B bands are found to have dependence on the metallic substitution. Values of the important spectral parameters, viz., molar extinction coefficient (E), oscillator strength (t), radiative transition rate and decay time of the excited singlet state are also presented and compared with other solid matrices. The recorded fluorescence spectrum shows two broad emission bands in the case ofNdPc, whereas for ZnPc only a very weak band is observed. The absence of emission bands for the other metallated phthalocyanines is attributed to increased spin orbit interaction and intersystem crossing.

Emission spectral studies of phthalocyanines in borate glass matrix

2000

Organic semiconductors play a very important role in today's high technology applications viz. optical imaging, optical switchng, optical computing, data storage, photodynamic therapy, dynamic holography, frequency mixing, harmonic generation and optical communications . Among the organic semiconductors the phthalocyanines (Pc), naphthalocyanines (Nc) and porphyrines (PP) are of special significance because of their inexpensiveness, thermal and environmental stability, non toxicity as well as excellent optical and electronic properties. A combination of these features makes them an important class of photo-electronic materials for applications in various optoelectronic devices. Moreover, because of their excellent optical absorption efficiency in the red or NIR region they can be effectively utilized as a laser dye also. Most of the studies reported so far discuss the optical characterization of these organic semiconductors either in thin films, crystals, vapor or other solvents whereas no work has been made to study the optical properties of these molecules in solid matrices especially work has been made to study the optical properties of these molecules in solid matrices especially a glassy matrix. Except for some studies in certain organic glassy matrices [5] only a limited amount of work has been done in organic matrices also. Recently our group has synthesized borate glassy matrices doped with metalatted phthalocyanines and rare earth doped phthalocyanines and studied their optical absorption characteristics The purpose of the present communication which is a continuation of the earlier work is to study the stimulated emission characterstics of metalatted phthalocyanine molecules in borate glass matrix with the intention of using them as efficient active media for solid state lasers.

Spectral studies of phthalocyanines

Photonics Letters of Poland

The paper presents the results of research of the optical properties of nickel-phthalocyanines (NiPc) in a wide spectrum range of optical radiation . Phthalocyanines belong to the group of organic semiconductors with a complicated molecular structure. Spectral characteristics of complex refractive index and optical transmission coefficient were determined. The tests were carried out in the range of wavelengths of optical radiation: 300-2500 nm. By means of Surface Plasmon Resonance (SPR) method, tests concerning the possibilities of using nickel phthalocyanines in gaseous sensors of nitrogen dioxide in atmospheres of air and nitrogen were carried out. Full Text: PDF ReferencesP. Górka, St. Kowalski, Investigation of air pollution, Ed. by SUT, Gliwice, Poland, 2000 CrossRef J. Ignac-Nowicka, T, Pustelny, Z. Opilski,E. Maciak,W. Jakubik, M. Urbanczyk, "Examination of thin films of phthalocyanineas in plasmon system for their application in NO2 sensors", Optical Engineering, ...

Optical absorption and emission spectral studies of phthalocyanine molecules in DMF

Journal of Porphyrins and Phthalocyanines (JPP), 2001

Optical absorption and emission spectral studies of various phthalocyanine (Pc) molecules in dimethyl formamide (DMF) solvent are reported in this paper. Measurements have been done for free base, Eu, Fe, Mn, Sm, Cu, Zn, Nd and La Pc-s. The principal optical transitions viz B and Q are identified and some of the important spectral parameters such as molar extinction coefficient (e), absorption cross section ( a ), dipole strength (q) and oscillator strength (f) are evaluated for the prominent Q-band. The measured radiative parameters viz emission cross section ( e ), fluorescence bandwidth (D) and optical gain (G) show wide variation among different systems. The results obtained are compared with other solid matrices such as glass and polymer.

Study on the UV-Visble of Ni-Phthalocyanine thin film Optical Properties

Thin films of Nickel Phthalocyanine (NiPc) are prepared of a base pressure of 10 -5 m bar using Edwards 306 system of thermal evaporation technique .The films are deposited on to glass substrate at various thickness (50, 265 , 350) nm. The optical properties and spectral behavior of NiPc films as a function of thickness were studied at room temperature using UV -Visible -NIR absorption spectra. Increase in thickness, leads to increase absorbance of films and shifts peak position of all bands towards low energy side of spectra. Direct allowed transitions near the sort absorption edges were observed. Present studies reveal that the optical energy gap of NiPc thin film is around (3.3-3.25) eV for direct energy band gap respect to B bands, and around (1.68-1.63) eV for direct energy band gap respect to Q bands. The UV-Visible bands of Ni-Phthalocyanine are broadened and overlap in the solution in dioxane compare with thin film. The energy gap is slightly dependent on the thin film thickness. The optical constant of absorption coefficient α, refractive index, n, and extinction coefficient, k, were calculated and it was found that they are slightly dependent of film thickness.

Optical properties of metal phthalocyanines

Journal of Materials Science, 2010

In this study, optical properties of phthalocyanines of five metals, i.e., cobalt, nickel, iron, copper, and manganese, have been discussed in the energy (E) range of 1.5-4.1 eV. Utilizing the available data of refractive index (n) and extinction coefficient (k) of these materials in the literature, the related optical properties such as the real (e 1), imaginary (e 2) parts of the complex dielectric constant (e), and reflectivity (R) are calculated. Interpretations for the energies corresponding to the peaks in e 2 are explained in terms of the Penn gap (E P). High-frequency dielectric constant (e ?) values corresponding to four models, i.e., the conventional Lorentz model, modified Lorentz model, relaxed Lorentz model, and the dual Lorentz model are used to determine E P. It is found that the E P values corresponding to the conventional and dual Lorentz models are in good agreement with the average of energy peaks in the RE and the e 2-E spectra. The oscillator energy (E 0) and the dispersion energy (E d) of these materials have been determined utilizing the Wemple-DiDomenico model. The calculated values of (a) E 0 are generally in good agreement with the Penn gap E P , the average of the energy peaks in the RE and the e 2-E spectra and (b) E d are comparable to those in the literature for CoPc and NiPc.

(2006) Ultraviolet and visible spectroscopic studies of phthalocyanine and its complexes thin films

Thin films of phthalocyanine and its complexes [magnesium, manganese, iron, cobalt, zinc and lead phthalocyanine] have been prepared by vacuum evaporation technique. The morphology of the deposited films has been studied using scanning electron microscope (SEM). The absorption, transmission and reflection spectra of these films have been studied in the wavelength range from 300 to 1000 nm. The optical band gap has been calculated from the absorption coefficient. It depending on the number of electron in the outer shell of the central metal. The extinction coefficient has been calculated directly from the spectra data. Also, the refractive indexes have been measured and discussed in the same range of wavelength from the absorption coefficient and extinction coefficient.

Physical and optical properties of phthalocyanine doped inorganic glasses

Journal of Materials …, 2000

Physical and optical properties of various free base and metallic phthalocyanine (Pc) doped glass matrix are reported for the first time. Absorption spectral measurements of H2Pc, MnPc, NiPc, CoPc, CuPc, MoOPc, ZnPc and FePc doped borate glass matrix have been ...