کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1888016 1533400 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Anomalous europium luminescence in LaF3
ترجمه فارسی عنوان
لومینسانس اروپیم ناهنجار در LaF3
کلمات کلیدی
LaF3؛ اروپائیوم؛ یتربیم؛ جذب؛ هیجان؛ آرامش دی الکتریک؛ لومینسانس ناهنجار
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
چکیده انگلیسی


• Optical spectra and dielectric relaxation were measured for Eu2+ in LaF3.
• Bulk conductivity is directly proportional to absorption coefficient of Eu2+ bands.
• Dielectric relaxation peak of LaF3–EuF3 is attributed to ipoles Eu2+-anion vacancy.
• Broadband Eu emission at 600 is attributed to so-called anomalous luminescence.

Optical spectra (absorption, emission, excitation, decay) and dielectric relaxation were measured for divalent europium and partially for ytterbium in lanthanum fluoride crystals. Optical absorption of LaF3–Eu2+ contains not only asymmetric weakly structured band at 245 nm but also less intense bands at 330, 380 nm. Broadband Eu2+ emission at 600 nm appeared below 80 K with decay time 2.2 μs at 7.5 K. Emission at 600 nm is attributed to so-called anomalous luminescence. Bulk conductivity is directly proportional to absorption coefficient of Eu2+ bands. Dielectric relaxation peak of LaF3–EuF3 is attributed to rotation of dipoles Eu2+-anion vacancy. The long-wavelength absorption at 300–400 nm region are assigned to transitions from 4f7Eu2+ ground state to states of neighbouring fluorine vacancy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Measurements - Volume 90, July 2016, Pages 80–83
نویسندگان
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