|
|
Preparation and characterization of selected optical materials
Hulicius, Eduard
Crystal structure and technology procedure was optimized to obtained better parameters of PL and RL as well as homogeneity of structure. Structural and optical parameters were measured and evaluated; their influence on crystal characteristics was discussed. New improved material was proposed. P.W = Peak wavelength; P.I = Peak intensity; FWHM = Full With in Half Maximum; D.W = dominant wavelength; I.W = integral w.; I.I = integrated intensity; R.F = reflectivity; T.H = thickness were measured.
|
|
| |
|
| |
|
|
Influence of Sc.sup.3+./sup. doping on Pr.sup.3+./sup. emission in epitaxial scintillation garnet layers
Hanuš, M. ; Kučera, M. ; Nikl, Martin ; Nitsch, Karel ; Průša, Petr ; Mareš, Jiří A. ; Onderišinová, Z.
Yttrium (Y3Al5O12) and lutetium (Lu3Al5O12) aluminium garnets doped by rare earths such as Ce, Eu, Pr, are considered as very good scintillation materials. The garnets have chemical, mechanical, and radiation stability superior to most of scintillation materials and light yield is high, thus they are often used as scintillation screens.
|
|
| |
|
|
Fotoluminiscence erbiem dopovaných krystalů KTaO.sub.3./sub..
Potůček, Zdeněk ; Bryknar, Z. ; Trepakov, Vladimír
Photoluminescence emission spectra of KTaO3:Er crystals was studied within the wide temperature (12 – 300 K) and spectral (300 – 1200 nm) regions in order to reveal luminescence centers related to Er ions and to elucidate their optical properties. Under excitation with band-gap light at low temperatures, the KTaO3:Er crystals shoved a broad asymmetric emission band peaking near 490 nm at 12 K that belongs to well-known “green” photoluminescence of KTaO3 crystals. Erbium doping was accompanied by appearance of narrow structured emission bands in the vicinity of 550, 660, and 850 nm that were attributed to radiative transitions within Er3+ ions with 4f11 electron configuration.
|
|
| |
|
| |
|
| |
|
| |
guest ::
