X-RAY EXCITED LUMINESCENCE YIELD SPECTRA OF NABR AND NABRCU SINGLE-CRYSTALS

X-ray excited optical luminescence yield spectra of single crystals of pure NaBr and Cu-activated NaBr are reported. X-rays are scanned at t he energy regions of K edges of Br and Na. The yield spectra for the i ntrinsic luminescence emission band of NaBr at 4.5 eV for both samples and those for the Cu impurity luminescence band at 3.4 eV are compare d. The results show that in the NaBr:Cu, both positive and negative ed ge jumps are observed depending on the monitored emission band. The yi eld spectra are reproduced with the calculation following our recent p henomenological theory.