采用溶剂热法和热分解法分别制备纳/微米的β-NaYF4∶20％Yb3+,2％Er3+晶体.根据两种不同粒径颗粒的TG-DTA测试分析,对其进行不同温度的热处理.通过XRD、SEM、FT-IR以及PL等手段研究不同热处理温度对两种粒径的颗粒的尺寸、形貌以及上转换发光性能的影响.研究结果表明,随着热处理温度的升高,纳/微米颗粒的发光性能主要呈现出先升高后下降的趋势.与未作热处理样品对比发现,适当的热处理(580℃)可以提高纳米颗粒的发光强度,却不利于改善微米颗粒发光性能.分析认为,结晶质量的提高、缺陷浓度的降低以及有机配体的去除,导致了纳/微米颗粒的发光性能的逐步提高.而过高处理温度(＞580℃)引起的相转变(β→α)和表面Na2CO3的生成又大大降低了稀土离子的发光效率.热处理过程中颗粒之间的不同团聚程度是造成纳/微米颗粒发光性能差异变化的主要原因.
参考文献
| [1] | Downing E,Hesselink L,Ralston J,et al.A three-color,solid-state,three-dimensional display.Science,1996,273(5279):1185-1189. |
| [2] | Chivian JS,Case W,Eden D.The photon avalanche:a new phenomenon in pr3+-based infrared quantum counters.Applied Physics Letters,1979,35(2):124-125. |
| [3] | Lodahl P,Van Driel AF,Nikolaev IS,et al.Controlling the dynamics of spontaneous emission from quantum dots by photonic crystals.Nature,2004,430(7000):654-657. |
| [4] | Shalav A,Richards B,Trupke T,et al.Application of NaYF4∶Er up-converting phosphors for enhanced near-infrared silicon solar cell response.Applied Physics Letters,2005,86(1):3505-3507. |
| [5] | Yi G,Lu H,Zhao S,et al.Synthesis,characterization,and biological application of size-controlled nanocrystalline NaYF4:Yb,Er infrared-to-visible up-conversion phosphors.Nano Letters,2004,4(11):2191-2196. |
| [6] | Menyuk N,Dwight K,Pierce J.NaYF4:Yb,Er-an efficient upconversion phosphor.Applied Physics Letters,1972,21(4):159-161. |
| [7] | Mathews M D,Ambekar B R,Tyagi A K,et al.High temperature X-ray diffraction studies on sodium yttrium fluoride.Journal of Alloys and Compounds,2004,377(1/2):162-166. |
| [8] | Page R H,Schaffers K I,Waide P A,et al.Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium.J.Opt.Soc.Am.B,1998,15(3):996-1008. |
| [9] | Li C,Quan Z,Yang J,et al.Highly Uniform and Monodisperse β-NaYF4∶Ln3+ (Ln =Eu,Tb,Yb/Er,and Yb/Tm) Hexagonal micropdsm crystals:hydrothermal synthesis and luminescent properties.Inorganic Chemistry,2007,46(16):6329-6337. |
| [10] | Wang L,Li Y.Controlled synthesis and luminescence of lanthanide doped NaYF4 nanocrystals.Chemistry of Materials,2007,19(4):727-734. |
| [11] | Boyer J C,Cuccia L A,Capobianco J A.Synthesis of colloidal upconverting NaYF4∶Er3+/yb3+ and Tm3+/Yb3+ monodisperse nanocrystals.Nano Letters,2007,7(3):847-852. |
| [12] | Zhang X,Yang P,Li C,et al.Facile and mass production synthesis of β-NaYF4∶Yb3+,Er3+/Tm3+ 1D microstructures with multicolor up-conversion luminescence.Chemical Communications,2011,47(44):12143-12145. |
| [13] | Teshima K,Lee S,Shikine N,et al.Flux Growth of highly crystalline NaYF4:Ln (Ln =Yb,Er,Tm) crystals with upconversion fluorescence.Crystal Growth & Design,2011,11(4):995-999. |
| [14] | Suzuki S,Teshima K,Wakabayashi T,et al.Low-temperature flux growth and upconversion fluorescence of the idiomorphic hexagonal-system NaYF4 and NaYF4:Ln (Ln =Yb,Er,Tm)crystals.Crystal Growth & Design,2011,11(11):4825-4830. |
| [15] | Suzuki S,Teshima K,Wakabayashi T,et al.Novel fabrication of NIR-vis upconversion NaYF4∶Ln (Ln =Yb,Er,Tm) crystal layers by a flux coating method.Journal of Materials Chemistry,2011,21(36):13847-13852. |
| [16] | Yi G S,Chow G M.Synthesis of hexagonal-phase NaYF4:Yb,Er and NaYF4∶Yb,Tm nanocrystals with efficient up-conversion fluorescence.Advanced Functional Materials,2006,16(18):2324-2329. |
| [17] | Wang Q,Tan M C,Zhuo R,et al.A Solvothermal route to size-and phase-controlled highly luminescent NaYF4∶Yb,Er up-conversion nanocrystals.Journal of Nanoscience and Nanotechnology,2010,10(3):1685-1692. |
| [18] | Wang Z,Tao F,Yao L,et al.Selected synthesis of cubic and hexagonal NaYF4 crystals via a complex-assisted hydrothermal route.Journal of Crystal Growth,2006,290(1):296-300. |
| [19] | Chen J,Guo C,Wang M,et al.Controllable synthesis of NaYF4∶Yb,Er upconversion nanophosphors and their application to in vivo imaging of Caenorhabditis elegans.Journal of Materials Chemistry,2011,21(8):2632-2638. |
| [20] | Qiu H,Chen G,Fan R,et al.Tuning the size and shape of colloidal cerium oxide nanocrystals through lanthanide doping.Chemical Communications,2011,47(34):9648-9650. |
| [21] | Tatzber M,Stemmer M,Spiegel H,et al.An alternative method to measure carbonate in soils by FT-IR spectroscopy.Environmental Chemistry Letters,2007,5(1):9-12. |
| [22] | Zhao J,Sun Y,Kong X,et al.Controlled synthesis,formation mechanism,and great enhancement of red upconversion luminescence of NaYF4∶Yb3+,Er3+ nanocrystals/submicroplates at low doping level.The Journal of Physical Chemistry B,2008,112(49):15666-15672. |
| [23] | Yu L,Song H,Liu Z,et al.Electronic transition and energy transfer processes in LaPO4-Ce3+/Tb3+ nanowires.The Journal of Physical Chemistry,B,2005,109(23):11450-11455. |
| [24] | Pradhan A,Zhang K,Loutts G,et al.Structural and spectroscopic characteristics of ZnO and ZnO:Er3+ nanosmtructures.Journal of Physics:Condensed Matter,2004,16(39):7123-7129. |
| [25] | Zhang X,Zhang J,Ren X,et al.The dependence of persistent phosphorescence on annealing temperatures in CaTiO3:Pr3+ nanoparticles prepared by a coprecipitation technique.Journal of Solid State Chemistry,2008,181(3):393-398. |
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