Abstract
Colloidal NaYF4 :Ce3+ /Tm3+ /Mn2+ nanocrystals found to be an efficient single component phosphor to produce intense white light. The use of Mn2+ ions instead of green- and red-emitting Ln3+ ions is interesting as the later are expensive and less abundant. The single band blue emission of Tm3+ ions was combined with the broadband green-yellow emission of Mn2+ ions to produce strong white light emission using Ce3+ ions as excitation source. Interestingly, there is hardly any re-absorption of the blue emission by Mn2+ ions and the spectrum matches the commercial Ce3+ -doped yttrium aluminium garnet (YAG) phosphor coated over a blue LED. In addition, we have successfully incorporated the colloidal nanocrystals into a polymer matrix to make a nanocomposite as well as transparent films without altering the optical properties of the nanocrystals. The colloidal nanocomposite was coated over a UV LED to fabricate white LEDs. Finally, when the concentration of the dopant (Mn2+ ) ions was tuned the correlated color temperature (CCT) values varied between cool white light and daylight region.
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