Effect of Local Structures on the Luminescence of Li[sub 2](Sr,Ca,Ba)SiO[sub 4]:Eu[sup 2+]
| Autor: | Kee-Sun Sohn, Chandramouli Kulshreshtha, Asish Kumar Sharma |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Ionic radius
Photoluminescence Renewable Energy Sustainability and the Environment Chemistry Analytical chemistry Mineralogy chemistry.chemical_element Phosphor Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Activator (phosphor) Materials Chemistry Electrochemistry Chromaticity Ternary operation Europium Luminescence |
| Zdroj: | Journal of The Electrochemical Society. 156:J52 |
| ISSN: | 0013-4651 |
| DOI: | 10.1149/1.3065098 |
| Popis: | The baricenter and crystal field splitting of the 5d transition of the Eu 2+ activator were approximated from the experimental spectrum data for Li 2 SrSiO 4 , Li 2 CaSiO 4 , and Li 2 BaSiO 4 hosts and examined in conjunction with the ionic radii of neighboring alkali earth ions and the local structure around the divalent europium activator. In addition, Li2(Sr,Ca,Ba)SiO 4 :Eu 2+ ternary phosphors were screened in terms of photoluminescence (PL) intensity and color chromaticity at an excitation of 400 nm to determine their suitability for use in white-light-emitting diodes. As a result, several intermediate compounds (mixtures or solid solutions) were pinpointed in a specific composition range in the Li 2 (Sr,Ca,Ba)SiO 4 :Eu 2+ ternary composition library. In particular, Li2(Ba 1-x Sr x )SiO 4 :Eu 2+ (0.3 < x < 0.6) showed the best performance in terms of both PL intensity and color chromaticity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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