[1] SHEN J, ZHAO L, HAN G. Lanthanide-doped upconverting luminescent nanoparticle platforms for optical imaging-guided drug delivery and therapy［J］. Adv. Drug Deliv. Rev., 2013, 65(5):744-755.

[2] 付作岭, 董晓睿, 盛天琦, 等. 纳米晶体中稀土离子的发光性质及其变化机理研究［J］. 中国光学, 2015, 8(1): 139-146.

    FU Z L, DONG X R, SHENG T Q, et al.. Luminescene properties and various mechanisms of rare earth ions in the nanocrystals［J］. Chin. Opt., 2015, 8(1):139-146. (in Chinese)

[3] LIU Y S, TU D T, ZHU H M, et al.. Lanthanide-doped luminescent nano-bioprobes: from fundamentals to biodetection［J］. Nanoscale, 2013, 5(4):1369-1384.

[4] CHEN G Y, SHEN J, OHULCHANSKYY T Y, et al.. (α-NaYbF4∶Tm3+)/CaF2 core/shell nanoparticles with efficient near-infrared to near-infrared upconversion for high-contrast deep tissue bioimaging［J］. ACS Nano, 2012, 6(9):8280-8287.

[5] SANDROCK T, SCHEIFE H, HEUMANN E, et al.. High-power continuous-wave upconversion fiber laser at room temperature［J］. Opt. Lett., 1997, 22(11):808-810.

[6] WONG H T, TSANG M K, CHAN C F, et al.. In vitro cell imaging using multifunctional small sized KGdF4∶Yb3+, Er3+ upconverting nanoparticles synthesized by a one-pot solvothermal process［J］. Nanoscale, 2013, 5(8):3465-3473.

[7] LI L, YANG Y L, FAN R Q, et al.. Conductive upconversion Er, Yb-FTO nanoparticle coating to replace Pt as a low-cost and high-performance counter electrode for dye-sensitized solar cells［J］. ACS Appl. Mater. Interf., 2014, 6(11):8223-8229.

[8] ZHOU H, MOUZON J, FARZANEH A, et al.. Colloidal defect-free silicalite-1 single crystals: preparation, structure characterization, adsorption, and separation properties for alcohol/water mixtures［J］. Langmuir, 2015, 31(30):8488-8494.

[9] LI Z Q, ZHANG Y, JIANG S. Multicolor core/shell-structured upconversion fluorescent nanoparticles［J］. Adv. Mater., 2008, 20(24):4765-4769.

[10] GAI S, LI C X, YANG P P, et al.. Recent progress in rare earth micro/nanocrystals: soft chemical synthesis, luminescent properties, and biomedical applications［J］. Chem. Rev., 2014, 114(4):2343-2389.

[11] LI L, GREEN K, HALLEN H, et al.. Enhancement of single particle rare earth doped NaYF4∶Yb, Er emission with a gold shell［J］. Nanotechnology, 2015, 26(2):025101.

[12] CHATTERJEE D K, RUFAIHAH A J, ZHANG Y. Upconversion fluorescence imaging of cells and small animals using lanthanide doped nanocrystals［J］. Biomaterials, 2008, 29(7):937-943.

[13] ZOU W Q, VISSER C, MADURO J A, et al.. Broadband dye-sensitized upconversion of near-infrared light［J］. Nat. Photon., 2012, 6(8):560-564.

[14] WANG H B, YI Z G, RAO L, et al.. High quality multi-functional NaErF4 nanocrystals: structure-controlled synthesis, phase-induced multi-color emissions and tunable magnetic properties［J］. J. Mater. Chem. C, 2013, 1(35):5520-5526.

[15] BOYER J C, VETRONE F, CUCCIA L A, et al.. Synthesis of colloidal upconverting NaYF4 nanocrystals doped with Er3+, Yb3+ and Tm3+, Yb3+ via thermal decomposition of lanthanide trifluoroacetate precursors［J］. J. Am. Chem. Soc., 2006, 128(23):7444-7445.

[16] WANG F, LIU X G. Upconversion multicolor fine-tuning: visible to near-infrared emission from lanthanide-doped NaYF4 nanoparticles［J］. J. Am. Chem. Soc., 2008, 130(17):5642-5643.

[17] NIU N, YANG P P, HE F, et al.. Tunable multicolor and bright white emission of one-dimensional NaLuF4∶Yb3+, Ln3+(Ln=Er, Tm, Ho, Er/Tm, Tm/Ho) microstructures［J］. J. Mater. Chem., 2012, 22(21):10889-10899.

[18] WANG H B, LU W, ZENG T M, et al.. Multi-functional NaErF4∶Yb nanorods: enhanced red upconversion emission, in vitro cell, in vivo X-ray, and T2-weighted magnetic resonance imaging［J］. Nanoscale, 2014, 6(5):2855-2860.

[19] DONG H, SUN L D, YAN C H. Energy transfer in lanthanide upconversion studies for extended optical applications［J］. Chem. Soc. Rev., 2015, 44(6):1608-1634.

[20] 胡荣璇, 王慧云, 郑彤, 等. Gd3+掺杂对NaYF4∶Yb3+, Tm3+/ Er3+纳米材料上转换荧光性能的影响［J］. 发光学报, 2015, 36(1):20-26.

    HU R X, WANG H Y, ZHENG T, et al.. Influence of Gd3+ doping on the upconversion luminescence properties of NaYF4∶Yb3+, Tm3+/Er3+ nanoparticles［J］. Chin. J. Lumin., 2015, 36(1):20-26. (in Chinese)

[21] NA H, WOO K, LIM K, et al.. Rational morphology control of β-NaYF4∶Yb, Er/Tm upconversion nanophosphors using a ligand, an additive, and lanthanide doping［J］. Nanoscale, 2013, 5(10):4242-4251.

[22] WANG X, ZHUANG J, PENG Q, et al.. A general strategy for nanocrystal synthesis［J］. Nature, 2005, 437(7055):121-124.

[23] TANG J, CHEN L, LI J, et al.. Selectively enhanced red upconversion luminescence and phase/size manipulation via Fe3+ doping in NaYF4∶Yb, Er nanocrystals［J］. Nanoscale, 2015, 7(35):14752-14759.

[24] WANG F, HAN Y, LIM C S, et al.. Simultaneous phase and size control of upconversion nanocrystals through lanthanide doping［J］. Nature, 2010, 463(7284):1061-1065.

[25] WANG F, LIU X G. Upconversion multicolor fine-tuning: visible to near-infrared emission from lanthanide-doped NaYF4 nanoparticles［J］. J. Am. Chem. Soc., 2008, 130(17):5642-5643.

[26] RAMASAMY P, CHANDRA P, RHEE S W, et al.. Enhanced upconversion luminescence in NaGdF4∶Yb, Er nanocrystals by Fe3+ doping and their application in bioimaging［J］. Nanoscale, 2013, 5(18):8711-8717.

[27] SUYVER J F, AEBISCHER A, BINER D, et al.. Novel materials doped with trivalent lanthanides and transition metal ions showing near-infrared to visible photon upconversion［J］. Opt. Mater., 2005, 27(6):1111-1130.

[28] SUYVER J F, GRIMM J, VAN VEEN M K, et al.. Upconversion spectroscopy and properties of NaYF4 doped with Er3+, Tm3+ and/or Yb3+［J］. J. Lumin., 2006, 117(1):1-12.

[29] BANSKI M, PODHORODECKI A, MISIEWICZ J, et al.. Selective excitation of Eu3+ in the core of small β-NaGdF4 nanocrystals［J］. J. Mater. Chem. C, 2013, 1(4):801-807.