ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 45, Number 6
JKCSEZ 45(6)
December 20, 2001 

The europium doped yttrium oxybromide phosphors were synthesized by solid-state reaction method. The YOBr:Eu³⁺ phosphor showed a strong and narrow red emission band at 621 nm and maximum emission intensity obtained when 0.05 mol Eu ions were doped. The red emission of Eu³⁺ originated from ⁵D₀ →⁷F₂ electric dipole transition. In order to investigate on photoluminescence behavior, several experimental skills and numerical fittings are conducted to the YOBr:Eu³⁺ phosphor. The emission spectrum was measured in the UV range and then decay curve of ⁵D₀ →⁷F_j transitions was examined. The energy interaction type of YOBr:Eu³⁺ phosphor was dipole-dipole interaction. In addition to the calculating by critical concentration, the critical distance (R₀) was calculated by decay curve fitting parameter from Inokuti-Hirayamas equation, and spectral overlap method. The critical distance was 17.03, 10.51 and 7.18Å for those methods, respectively. As considering systematic error of measurements, these values are within the same order, so that the above fitting methods are plausible and recommendable.