Time-resolved Ax-luminescence of NaI:Tl under electron pulse irradiation

• Дата: 2016
• Автори: Yakovlev, V., Trefilova, L., Alekseev, V., Krasnov, V.
• Формат: Стаття
• Мова: English
• Опубліковано: НТК «Інститут монокристалів» НАН України 2016
• Назва видання: Functional Materials
• Теми: Characterization and properties
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/121515
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Time-resolved Ax-luminescence of NaI:Tl under electron pulse irradiation / V. Yakovlev, L. Trefilova, V. Alekseev, V. Krasnov // Functional Materials. — 2016. — Т. 23, № 4. — С. 540-545. — Бібліогр.: 26 назв. — англ.

This paper studies spectral-kinetic properties of NaI:Tl cathodoluminescence registered in the region of Ax-band with maximum 425 nm within the time interval of 10⁻⁸-10⁻² s. Ax-luminescence of NaI:Tl crystal has been excited with an electron pulse (Ee = 0.25 MeV, t1/2 = 10 ns, W = 0.003...0.16 J/cm2) at temperatures in the range of 65-300 K. It has been found that the cathodoluminescence kinetics of NaI:Tl crystal at 425 nm has beside the exponential decay (τ = 235 ns at T = 295 K) also three more components: the fastest exponential decay (τ = 12 ns at T = 78 K), post-irradiation rise on a submicrosecond time scale at T≥128 K and slow exponential decay at T≥160 K. A model has been suggested according to which Ax-luminescence at 425 nm is caused by 11→1S0 electron transition of Tl+ ion. It has been explained that the fast decay and post-irradiated rise components are caused by ³P₁→¹P₁ and ³P₀→³P₁ electron transitions of Tl<m^>+ ion, respectively. The scintillation process in NaI:Tl has been discussed.