Orderly aligned and highly luminescent monodisperse rare-earth   orthophosphate nanocrystals synthesized by a limited anion-exchange   reaction

doi:10.1021/cm071073l

CORC > 北京大学 > 化学与分子工程学院

	Orderly aligned and highly luminescent monodisperse rare-earth orthophosphate nanocrystals synthesized by a limited anion-exchange reaction
	Mai, Hao-Xin ; Zhang, Ya-Wen ; Sun, Ling-Dong ; Yan, Chun-Hua
刊名	chemistry of materials
	2007
关键词	BINARY NANOPARTICLE SUPERLATTICES LIQUID-PHASE SYNTHESIS QUANTUM DOTS OXIDE NANOCRYSTALS OPTICAL-PROPERTIES ENERGY-TRANSFER THIN-FILMS SEMICONDUCTOR PARTICLES NANOWIRES
DOI	10.1021/cm071073l
英文摘要	High-quality dispersible nanocrystals of REPO(4) (RE = La, Eu, Tb, Y, Ho), LaPO(4):Ce,Tb, and REPO(4):Eu (RE = La,Y) with diverse shapes (nanopolyhedra, quasinanorods, nanorods, and nanowires) were synthesized at temperatures in the range of 180-260 degrees C in long alkyl-chain solvents (organic acids and amines), via a limited anion-exchange reaction (LAER). Using H(3)PO(4) as a precipitator in the LAER, we obtained REPO(4) nanocrystals from the precipitation reaction significantly retarded by the strong bonding interactions among the rare earth cations and organic acid ligands. The shape of the nanocrystals can be manipulated to 0D polyhedra, 1D rods, and 1D wires by changing the composition of the solvent and the alkyl-chain length of the capping ligands. The LaPO(4):Ce,Tb and REPO(4):Eu (RE = La,Y) nanocrystals show intensive green and red emissions under UV excitation, respectively, with quantum yields higher than 40%. Interestingly, the charge-transfer band decided by the RE-O bond distance and the ratio of the I(610)/I(590) determined by the symmetries of the Eu(3+) ions in the host lattice are observed to vary with crystallite size for the differently shaped REPO(4):Eu nanocrystals. The highly luminescent nanocrystals can be orderly aligned to form various 2D and 3D nanoarrays on the copper grids by tuning the concentration of the nanocrystal dispersion in cyclohexane, showing their potential in constructing new self-assembled luminescence devices. Moreover, the demonstrated LAER strategy is extendable to the synthesis of many other rare earth salt nanocrystals, such as vanadates and fluorides.; Chemistry, Physical; Materials Science, Multidisciplinary; SCI(E); EI; 0; ARTICLE; 18; 4514-4522; 19
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/249707]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Mai, Hao-Xin,Zhang, Ya-Wen,Sun, Ling-Dong,et al. Orderly aligned and highly luminescent monodisperse rare-earth orthophosphate nanocrystals synthesized by a limited anion-exchange reaction[J]. chemistry of materials,2007.
APA	Mai, Hao-Xin,Zhang, Ya-Wen,Sun, Ling-Dong,&Yan, Chun-Hua.(2007).Orderly aligned and highly luminescent monodisperse rare-earth orthophosphate nanocrystals synthesized by a limited anion-exchange reaction.chemistry of materials.
MLA	Mai, Hao-Xin,et al."Orderly aligned and highly luminescent monodisperse rare-earth orthophosphate nanocrystals synthesized by a limited anion-exchange reaction".chemistry of materials (2007).