Ca0.95Si2O2N2: Eu-0.05(2+) fluorescent nanobelt fibers for the far field encapsulation of white LEDs were prepared through electrospinning combined with gas-reduction method. By adjusting the ratio of spinning solution, the Ca-Si-O-Eu precursor nanofibers and Ca0.95Si2O2N2: Eu-0.05(2+) luminescence nanofibers with belt structure were obtained. The obtained samples were characterized by FE-SEM, XRD, PL and HSP-3000 LED test system. The obtained sample not only keeps the morphology of nanobelt fiber but also assembles as film with a certain mechanical strength. XRD patterns of sample nitridized at 125 degrees C for 4 h demonstrated that it crystallized well which was assigned to JCPDF card of the CaSi2O2N2 crystal, and it maintained CaSi2O2N2 phase after doping Eu2+ ions. Under ultraviolet excitation (400 nm), the emission spectra of Eu2+-doped Ca0.95Si2O2N2 sample contains a board peak near 550 nm, which results from Eu2+ 4f(6)5d -> 4f(7) transition. Based on the far field encapsulation, white LEDs with low correlated color temperature (4832 K), high-color-rendering index (86) and luminous efficacy of 125 lm/W, were fabricated using the Ca0.95Si2O2N2: Eu-0.05(2+) nanobelt fiber mat and blue chip.

• Journal: Journal Of Inorganic Materials
• Volume: 31
• Issue: 1
• Pages: 14-19
• ISSN: 1000-324X
• DOI: 10.15541/jim20150249
• Year: 2016
• Number:
• Type: