Synthesis and Properties of Nanobelt CaSi2O2N2: Eu0.052+ Fluorescence Fibers

doi:10.15541/jim20150249

Abstract

Abstract:

Ca_0.95Si₂O₂N₂: Eu_0.05²⁺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 Ca_0.95Si₂O₂N₂: Eu_0.05²⁺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 1250℃ for 4 h demonstrated that it crystallized well which was assigned to JCPDF card of the CaSi₂O₂N₂crystal, and it maintained CaSi₂O₂N₂phase after doping Eu²⁺ions. Under ultraviolet excitation (400 nm), the emission spectra of Eu²⁺-doped Ca_0.95Si₂O₂N₂sample contains a board peak near 550 nm, which results from Eu²⁺4f⁶5d→4f⁷ 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 Ca_0.95Si₂O₂N₂: Eu_0.05²⁺ nanobelt fiber mat and blue chip.

Key words: nanobelt fiber, electrospinning, fluorescence fiber, far field encapsulation

CLC Number:

TB34

ZHAO Hai-Lei, CUI Bo, WANG Hong-Zhi, LI Yao-Gang, ZHANG Qing-Hong. Synthesis and Properties of Nanobelt CaSi₂O₂N₂: Eu_0.05²⁺Fluorescence Fibers[J]. Journal of Inorganic Materials, 2016, 31(1): 21-26.

Figures/Tables 8

Fig. 1 SEM images of fibrous membranes before (a) and after (b) heat treatment at 500℃

Fig. 2 Schematic representation of the formation mechanism of nanobelt fibers

Fig. 3 XRD patterns of the fiber precursor samples nitridized at different temperatures (a) and FE-SEM image (b), digital photo (c), and digital photo under purple light (d) of nanobelt fiber mat after nitridized at 1250℃

Fig. 4 TGA curves of the fiber precursor sample (a) and strength curve through three point bending test of the nanobelt fiber mat after nitridating under 1250℃

Fig. 5 Excitation and emission spectra of Ca0.95Si2O2N2: Eu0.05 nanobelt phosphor fibers

Fig. 6 Photoluminescence spectra of the Ca0.95Si2O2N2: Eu0.05 phosphor fiber mat nitridized at different temperatures (a) and nitridized at 1250℃ for different time (b)

Fig. 7 Digital pictures of the LEDs encapsulated with Ca0.95Si2O2N2: Eu0.05 nanobelt phosphor fiber mats and the chromaticity coordinates (a, b) Commercial lighting blue chip; (c, d) Encapsulated LEDs A and B; (e) The chromaticity coordinates

Table 1 Electroluminescence properties of LED lamps fabricated with Ca0.95Si2O2N2: Eu0.05 nanobelt phosphor fiber mat and Ca0.95Si2O2N2: Eu0.05 powder

Sample	Correlated color temperature/K	CIE value	Color rendering index	Efficacy/(lm·W^-1)
Phosphor powder	5349	(0.3421, 0.3615)	82	80.5
Sample B	4832	(0.3510, 0.3985)	86	125.0

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Synthesis and Properties of Nanobelt CaSi₂O₂N₂: Eu_0.05²⁺Fluorescence Fibers

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