Luminescence properties of KAlP2O7 crystals
doped with chromium ions
O.V. Gomenyuk*, S.G. Nedilko, N.V. Stus, O.V. Chukova
Kyiv National Taras Schevchenko University, 2, acad. Hlushkov Ave., block 1, 03680 Kyiv, Ukraine
Abstract. Luminescence properties of the KAlP2O7 crystals doped with the chromium ions
were investigated. Luminescence spectra consist of two main bands: one of them lies in the
blue-green spectral region and the other lies in the red spectral region. The maximum positions
of the bands depend on the crystal composition and temperature of the samples. The
blue-green band consists at least of three components. Complex structure of the blue-green
broad band results from a superposition of matrix intrinsic radiation and emission of the
distorted CrO4 2- groups, where chromium ions have 6+ ion charge. The red luminescence
band and the narrow spectral lines observed for the chromium-doped KAlP2O7 crystals were
assigned to electron transitions in the Cr3+ ions in octahedral oxygen surround. Structure
peculiarities of the various types of the chromium luminescence centers formed in the investigated
matrix are discussed.
Keywords: phosphate, aluminum, chromium, impurity ion, luminescence.
Paper received 19.11.03; accepted for publication 30.03.04.
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