Shasmal, Nilanjana and Karmakar, Basudeb
(2019)
White light-emitting Dy3+-doped transparent chloroborosilicate glass: synthesis and optical properties.
Journal of Asian Ceramic Societies, 7 (1).
pp. 42-52.
ISSN 2187-0764
Abstract
Dy3+-doped chloroborosilicate glasses with the composition 35.7SiO(2)-25.5B(2)O(3)-17BaO-3.4K(2)O-3.4Al(2)O(3)-15BaCl(2) (mol%) were prepared using melt quenching technique. The glass transition temperature (T-g) was similar to 610 degrees C. In UV-vis-NIR absorption spectra, characteristic absorption bands of Dy3+ appeared at 322, 347, 364, 388, 795 and 880nm due to spectral transitions from the H-6(15/2) level to various higher levels of Dy3+ ion. The excitation spectrum was recorded at within 200-550nm by monitoring emissions at 576nm. The excitation bands at 392, 428, 453 and 472nm were attributed to the (H15/2I13/2)-H-6-I-4, (4)G(11/2), I-4(15/2) and F-4(9/2) transitions, respectively. Prominent emission bands were observed at wavelengths of 484, 576, 664 and 754nm when excited at 447nm. The bands correspond to the transitions (F9/2H15/2)-F-4-H-6, (F9/2H13/2)-F-4-H-6, (F9/2H11/2)-F-4-H-6 and (F9/2H9/2)-F-4-H-6 F-6(11/2), respectively. The emitted light from all the samples was found to be white. Their color coordinates lie within the white range. The sample containing 0.5wt% Dy2O3 emitted white light with the color coordinates x=0.351, y=0.335, which are the very closest to pure white light and whose color temperature of 4716K is similar to daylight. Such white light-emitting transparent glasses promise to be enormously useful for various photonic applications.
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