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Bhagat S.A.,Kamla Nehru College | Borghate S.V.,New English Junior College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2014

Pure and Li+-doped Alq3 complexes were synthesized by simple precipitation method at room temperature, maintaining the stoichiometric ratio. These complexes were characterized by X-ray diffraction, ultraviolet-visible absorption and Fourier transform infrared and photoluminescence (PL) spectra. X-ray diffraction analysis reveals the crystalline nature of the synthesized complexes, while Fourier transform infrared spectroscopy confirm the molecular structure, the completion of quinoline ring formation and presence of quinoline structure in the metal complex. Ultraviolet-visible and PL spectra revealed that Li+ activated Alq3 complexes exhibit the highest intensity in comparison to pure Alq3 phosphor. Thus, Li+ enhances PL emission intensity when doped into Alq3 phosphor. The excitation spectra lie in the range of 383-456 nm. All the synthesized complexes other than Liq give green emission, while Liq gives blue emission with enhanced intensity. Thus, he synthesized phosphors are the best suitable candidates for green- and blue-emitting organic light emitting diode, PL liquid-crystal display and solid-state lighting applications. Copyright © 2013 John Wiley & Sons, Ltd.


Zade A.B.,Rashtrasant Tukadoji Maharaj Nagpur University | Kalbende P.P.,Rashtrasant Tukadoji Maharaj Nagpur University | Upase A.B.,New English Junior College | Belsare G.W.,P.A. College
Journal of the Indian Chemical Society | Year: 2012

Formation of water soluble deeply colored ternary complexes of Th IV and U VI metal ions with pyrogallol red (PGR) in presence of cationic surfactant cetyldimethylethylammonium bromide (CDMEAB) have been observed. CDMEAB sensitize the color reactions of Th IV and U VI with pyrogallol red with enhancement in molar absorptivities and sensitivities at the shifted wavelength of ternary complexes with stoichiometric composition 1 : 2 : 4 (M-PGR-CDMEAB) have been observed for both the metal ions. The ternary complexes of thorium(IV) ar pH 4.0 and uranium(VI) at pH 7.0 exhibit absorption maxima at 660 and 650 nm with molar absorptivities 61120 and 52470 L mol- 1 cm- 2 respectively. Beer's law were obeyed in concentration range 0.23-3.24 ppm for Th IV and 0.27-3.51 ppm for U VI in presence of CDMEAB. Conditional formation constants and various analytical parameters have been evaluated and compared the results of newly formed ternary complexes with binary complexes reported earlier. Enhancement in the molar absorptivities in presence of CDMEAB clearly indicated the usefulness of these colored reactions for microdetermination.


Bhagat S.A.,Kamla Nehru College | Borghate S.V.,New English Junior College | Koche N.S.,Kamla Nehru College | Thejo Kalyani N.,Laxminarayan Institute of Technology | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Optik | Year: 2014

Pure and Ba2+ doped Alq3 complexes were synthesized by simple precipitation method at room temperature, maintaining stoichiometric ratio. These complexes were characterized by XRD, UV-vis and FT-IR and photoluminescence (PL) spectra. XRD analysis reveals the polycrystalline nature of the synthesized complexes, while UV and FTIR confirm the molecular structure and the completion of quinoline ring formation and presence of quinoline structure in the metal complex. PL spectra of Alq3 compared with barium doped complexes exhibit highest intensity in comparison to Alq 3 phosphor, which proves that barium enhances PL emission intensity of Alq3 phosphor. The excitation spectra of the synthesized complexes are in the range of 300-480 nm with a broad peak in the range of 429-440 nm and shoulder at 380 nm, but with varying intensity. The emission wavelength lies in the range of 501-506 nm. Among all the synthesized complexes, AlBa 2q5 exhibits maximum emission intensity. These remarkable properties of AlBaq5 could be considered as promising materials as optoelectronic materials as well as green light emissive materials for OLEDs, PLLCD and solid state lighting applications. © 2014 Elsevier GmbH.


Bhagat S.A.,Kamla Nehru College | Borghate S.V.,New English Junior College | Kalyani N.T.,Laxminarayan Institute of Technology | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2015

Pure and Na+-doped Alq3 complexes were synthesized by a simple precipitation method at room temperature, maintaining a stoichiometric ratio. These complexes were characterized by X-ray diffraction, Fourier transform infrared (FTIR), UV/Vis absorption and photoluminescence (PL) spectra. The X-ray diffractogram exhibits well-resolved peaks, revealing the crystalline nature of the synthesized complexes, FTIR confirms the molecular structure and the completion of quinoline ring formation in the metal complex. UV/Vis absorption and PL spectra of sodium-doped Alq3 complexes exhibit high emission intensity in comparison with Alq3 phosphor, proving that when doped in Alq3, Na+ enhances PL emission intensity. The excitation spectra of the synthesized complexes lie in the range 242-457 nm when weak shoulders are also considered. Because the sharp excitation peak falls in the blue region of visible radiation, the complexes can be employed for blue chip excitation. The emission wavelength of all the synthesized complexes lies in the bluish green/green region ranging between 485 and 531 nm. The intensity of the emission wavelength was found to be elevated when Na+ is doped into Alq3. Because both the excitation and emission wavelengths fall in the visible region of electromagnetic radiation, these phosphors can also be employed to improve the power conversion efficiency of photovoltaic cells by using the solar spectral conversion principle. Thus, the synthesized phosphors can be used as bluish green/green light-emitting phosphors for organic light-emitting diodes, flat panel displays, solid-state lighting technology - a step towards the desire to reduce energy consumption and generate pollution free light. Copyright © 2014 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd.

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