http://nopr.niscair.res.in/handle/123456789/4777 Special issue on Luminescence and its Applications http://nopr.niscair.res.in/retrieve/24755 http://nopr.niscair.res.in/handle/123456789/4777 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/4792 Title: Eu³⁺ luminescence in Na₃SO₄F and NaMgSO₄F halosulphate phosphor for mercury-free lamps <br/> <br/>Authors: Nagpure, I M; Dhoble, S J; Godbole, S V; Bhide, M K; Pode, R B <br/> <br/>Abstract: Polycrystalline Na₃SO₄F:Eu and NaMgSO₄F:Eu phosphors prepared by a wet chemical method has been studied for its photoluminescence (PL) characteristics. PL emission spectra of Na₃SO₄F and NaMgSO₄F, phosphors under 393 nm excitation (mercury-free excitation) shows very strong prominet peak at 591 nm due to⁵D_o→⁷F₁ transition and 613 nm corresponding to ⁵D_o→⁷F₂ transition in the red region of the spectrum<b style="">. </b>The PL emission spectra of Eu³⁺ionin the Na₃SO₄F:Eu and NaMgSO₄F:Eu phosphors are applicable for mercury free lamp industries. <br/> <br/>Page(s): 181-184 Fri, 29 May 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/4791 Title: Thermoluminescence dosimetric study of X-ray irradiated BAM:Eu <br/> <br/>Authors: Murthy, K V R; Prasad, A S Sai; Rao, B Subba; Rey, Louis <br/> <br/>Abstract: Thermoluminescence of 0.5Gy X-ray irradiated BAM:Eu has been studied. The irradiated phosphor has been studied for its TL properties after one week of irradiation and after 100 weeks of storage. The TL of BAM recoded after one week of irradiation and after 100 weeks of storage. Before storage for 100 weeks the TL of 0.5Gy X-ray irradiated phosphor displays a broad TL with a hump around 180^oC followed by a peak at 273°C. After storage for 100 weeks the TL pattern entirely changed, i.e., the mixed peak emerged as two well resolved and high intensity peaks at 215 and 300^oC. Normally after storage to 100 weeks, the peak at 190^oC reduces its intensity or disappears in most cases, instead of that the peak appears at 215°C is a well resolved and the intensity is almost to the intensity of 300^oC peak. Since the TL phenomenon observed is interesting. The two well resolved, isolated, high intensity peaks observed after 100 weeks of storage approves this BAM:Eu can be used as TL dosimetric material. The photoluminescence (PL) of BAM:Eu excited with 254 nm given an emission peak at 450 nm. <br/> <br/>Page(s): 169-171 Fri, 29 May 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/4790 Title: Synthesis and thermoluminescence studies of Sr₄Al₁₄O₂₅:Eu²⁺ phosphor <br/> <br/>Authors: Sharma, Suchinder; Pitale, Shreyas; Malik, M M; Dubey, R N; Qureshi, M S; Vasisth, S K; Pathak, P <br/> <br/>Abstract: Trapping parameter, the activation energy (<i style="">E</i>), the order of kinetics (<i style="">b</i>) and the frequency factor (<i style="">s</i>), are determined for the solution combustion synthesized Sr₄Al₁₄O₂₅: Eu²⁺ phosphor using ⁶⁰Co irradiation source. The glow curve is a double peak structure with prominent peak at 487 K with shoulder at 423 K. Non-shifting <i style="">T</i>_m property is utilized for the trap parameter determination. Glow curve deconvolution (GCD) is carried out on recorded glow curves after gamma radiations. The trap depths calculated ranges between 0.5-1.36 eV. The linearity characteristic of the present phosphor and the fading experiments suggests the aptness of present phosphor towards dosimetric applications. <br/> <br/>Page(s): 165-168 Fri, 29 May 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/4789 Title: Swift heavy ion induced thermoluminescence studies in polycrystalline aluminum oxide <br/> <br/>Authors: Nagabhushana, K R; Lakshminarasappa, B N; Revannasiddaiah, D; Haranath, D; Singh, Fouran <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> When energetic swift heavy ions interact with matter, inelastic collision (leading to electronic energy loss-<i style="">S</i>_e) and elastic collision (leading to nuclear energy loss -<i style="">S</i>_n) take place. In the present study, the effect of energetic ion species on thermoluminescence (TL) of polycrystalline aluminum oxide (PAO) is reported. PAO pellets of 6 mm diameter are irradiated with energetic Au⁹⁺, Ni⁷⁺ and Si⁷⁺ ions for the fluence of 1×10¹³ ions cm^-2. A single well resolved prominent TL glow with peak at 538 K is observed in Si7+ irradiated samples. However, in Ni⁷⁺ and Au⁹⁺irradiated samples a prominent TL glow with peak at 610 K along with a shoulder at 513 K is observed. On the other hand, when PAO samples are irradiated with g-rays two well separated TL glows with peaks at 483 K and 638 K are observed. A prominent PL emission with peak at 430 nm besides a weak emission with peak at 480 nm and a shoulder at 525 nm are observed in 120 MeV Au⁹⁺ion irradiated samples when excited with 320 nm. These PL peaks are attributed to F, F₂⁺ and F₂²⁺-centers respectively. However, in Si⁷⁺ irradiated samples a single PL emission peak at 430 nm is observed and it is attributed to F-centers. </smarttagtype> <br/> <br/>Page(s): 161-164 Fri, 29 May 2009 22:58:59 GMT