Abstract
The emission, excitation and reflection spectra at 300, 80 and 13 K were obtained. For CaS:Bi 3+ , the green (515 mµ) and orange (588 mµ) emission bands are observed as well as the well-known blue (450 mµ) emission band at 300 K. CaSe:Bi 3+ shows blue-green (500 mµ) and red (645 mµ) emission bands at 80 K. CaO:Bi 3+ shows only one emission band in UV region (393 mµ at 300 K). Phonon structures are observed in some of the emission and excitation bands of CaS:Bi 3+ and CaO:Bi 3+ at low temperatures. the peaks of A , B and C excitation bands are found at 412, 347 and 312 mµ for CaS:Bi 3+ , and at 452, 385 and 344 mµ for CaSe:Bi 3+ at 80 K. The values of ζ calculated from these energies are 0.44 eV for CaS:Bi 3+ and 0.38 eV for CaSe:Bi 3+ .
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
