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Pure α‐NaYF4: Nd3+ nanocrystals of various sizes from 6 nm to 18 nm were successfully synthesized by a solvothermal method. The monodispersed oleate‐capped nanocrystals were dispersed in several nonpolar solvents to obtain stable colloidal. Under the excitation by an 803 nm laser, luminescent decay curves of the colloidal were measured. The relationship between emission lifetimes of samples and effective refractive indices of solvents was studied for the local field correction factor. In the 18 nm sample, the real cavity model was preferable model. As the particle size decreased to 6 nm, the preferred model altered from the real cavity model to the virtual cavity model which might be derived from changing of polarizability density. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

We experimentally demonstrate the fabrication of a tellurite hollow core photonic crystal fiber (HC-PCF) which has a large hexagonal hollow core in the center. The fiber is successfully obtained by using rotational casting and rod-in-tube methods. The fiber diameter is about 160¯m, the diameter of the central hollow core is 19¯m and the thickness of the wall is 0.35¯m. A supercontinuum light source from 500 nm to more than 1500 nm is launched into the hollow core of a 7-cm-long fiber. The result shows that the transmission mode can be confined into the hollow core of the tellurite HC-PCF for the first time.