Tunable blue-green emission and energy transfer properties in beta-Ca-3(PO4)(2): Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs

	Tunable blue-green emission and energy transfer properties in beta-Ca-3(PO4)(2): Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs
	Li,Kai; Zhang,Yang; Li,Xuejiao; Shang,Mengmeng; Lian,Hongzhou; Lin,Jun
刊名	dalton transactions
	2015
卷号	44 期号:10 页码:4683-4692
关键词	LIGHT-EMITTING-DIODES LUMINESCENCE PROPERTIES WHITE LEDS PHOTOLUMINESCENCE PROPERTIES OXIDIC PHOSPHORS MN2+ PHOSPHORS TEMPERATURE BACA2MGSI2O8EU2+ MICROSTRUCTURES ENHANCEMENT
通讯作者	lian,hz
英文摘要	a series of eu2+ and tb3+ singly-doped and co-doped beta-ca-3(po4)(2) phosphors have been synthesized via the high-temperature solid-state reaction method. thermogravimetric (tg) analysis, fourier transform infrared (ft-ir) spectra, x-ray diffraction (xrd) patterns and rietveld refinements, photoluminescence (pl) spectra including temperature-dependent pl and quantum efficiency, and fluorescence decay lifetimes have been used to characterise the as-prepared samples. under uv excitation, beta-ca-3(po4)(2): eu2+ presents a broad emission band centered at 415 nm, which can be decomposed into five symmetrical bands peaking at 390, 408, 421, 435 and 511 nm based on the substitution of five kinds of ca2+ sites by eu2+ ions. beta-ca-3(po4)(2): tb3+ shows characteristic emission lines under tb3+ 4f-5d transition excitation around 223 nm. in beta-ca-3(po4)(2): eu2+, tb3+ phosphors, similar excitation spectra monitored at 415 and 547 nm have been observed, which illustrates the possibility of energy transfer from eu2+ to tb3+ ions. the variations in the emission spectra and decay lifetimes further demonstrate the existence of energy transfer from eu2+ to tb3+ ions under uv excitation. the energy transfer mechanism has been confirmed to be dipole-quadrupole, which can be validated via the agreement of critical distances obtained from the concentration quenching (12.11 angstrom) and spectrum overlap methods (9.9-13.2 angstrom). the best quantum efficiency can reach 90% for the beta-ca-3(po4)(2):0.01eu(2+), 0.15tb(3+) sample under 280 nm excitation. these results show that the developed phosphors may possess potential applications in uv-pumped white light-emitting diodes.
收录类别	SCI
语种	英语
WOS记录号	WOS:000350543000035
公开日期	2016-05-31
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/65159]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Li,Kai,Zhang,Yang,Li,Xuejiao,et al. Tunable blue-green emission and energy transfer properties in beta-Ca-3(PO4)(2): Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs[J]. dalton transactions,2015,44(10):4683-4692.
APA	Li,Kai,Zhang,Yang,Li,Xuejiao,Shang,Mengmeng,Lian,Hongzhou,&Lin,Jun.(2015).Tunable blue-green emission and energy transfer properties in beta-Ca-3(PO4)(2): Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs.dalton transactions,44(10),4683-4692.
MLA	Li,Kai,et al."Tunable blue-green emission and energy transfer properties in beta-Ca-3(PO4)(2): Eu2+, Tb3+ phosphors with high quantum efficiencies for UV-LEDs".dalton transactions 44.10(2015):4683-4692.