کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8160367 | 1525104 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal growth and optical characterization of chromium-doped l-arginine phosphate monohydrate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Crystal growth and optical characterization of chromium-doped l-arginine phosphate monohydrate Crystal growth and optical characterization of chromium-doped l-arginine phosphate monohydrate](/preview/png/8160367.png)
چکیده انگلیسی
l-arginine phosphate monohydrate single crystals doped with Cr3+ ions (LAP:Cr) were grown by slow cooling method, with dimensions up to 10â¯Ãâ¯10â¯Ãâ¯8 mm3. Chromium ions induce a drastic reduction of overall growth rate and produce a drastic change in LAP growth morphology. The functional groups of LAP:Cr crystals were confirmed by FTIR analysis and compared with pure LAP. The optical band gap of LAP:Cr was determined from UV-VIS-NIR transmittance spectrum. Optical absorption spectrum at room temperature and 10â¯K was measured consisting of two large bands due to the 4A2 â 4T2 and 4A2 â 4T1 transitions and a narrower band attributed to the 4A2 â 2E spin-forbidden transition, characteristic of Cr3+ ions. Luminescence spectra of pure and Cr3+-doped samples were collected with excitation at wavelength of 350â¯nm and 335â¯nm. Emissions from host LAP matrix and Cr3+ ions were observed. Excited with 350â¯nm the spectra reveal a broad intense band from 21000 to 26000â¯cmâ1 region due to electronic transition from LAP ligand. The emission spectra of doped sample present two broad bands centered at 12346â¯cmâ1 and 13412â¯cmâ1 from 2E â 4A2 and 4T2 â 4A2 transitions, characteristics of luminescence from Cr3+ ions. From these results the Racah and crystal-field Cr3+ parameters were evaluated and comparing with those obtained in similar systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 545, 15 September 2018, Pages 390-396
Journal: Physica B: Condensed Matter - Volume 545, 15 September 2018, Pages 390-396
نویسندگان
Ricardo C. Santana, Simone F.A. Cruz, Maria C. Terrile, LuÃs Antônio O. Nunes, Jesiel F. Carvalho,