Influence of iodine impurity on photochemical and emission processes in CdBr₂:Cu crystals

• Дата: 2004
• Автори: Novosad, S.S., Novosad, I.S.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2004
• Назва видання: Functional Materials
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/139300
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Influence of iodine impurity on photochemical and emission processes in CdBr₂:Cu crystals / S.S. Novosad, I.S.Novosad // Functional Materials. — 2004. — Т. 11, № 2. — С. 264-267. — Бібліогр.: 26 назв. — англ.

Influence of iodine impurity on photochemical and emission processes in CdBi^Cu crystals have been studied under N₂ laser and X-ray excitation. After the materials irradiation by the integral emission of a deuterium lamp at 295 K, additional bands peaked near 395 and 625 nm were revealed that are due to Cu²⁺ and nCu⁰ centers, respectively. The photochemical transformations in those systems have been shown to be related mainly to changes in the charge state of copper centers. UV irradiation of CdBr₂:Cu,l results in decreased X-ray luminescence intensity in the non-elementary 510 nm band, weakened 620 nm band and increased intensity of the photoluminescence band peaked at 490-500 nm at 85 K. After the colored samples were heated to about 300 °C, no features due to the photochemical transformations have been observed in the spectral characteristics. The emission band peaked at 490 to 500 nm is related to the emissive annihilation of excitons localized at l_ ions. The photoluminescence in the 620 nm band is supposed to be due to complex centers containing anion vacancies and iodine ions.