Figure 3

(a) Optical image of isolated horizontal positioned single Y_1.94O₃:Ho³⁺_0.02/Yb³⁺_0.04 nanorod bundle and inset shows fluorescent image of isolated horizontally positioned single Y_1.94O₃:Ho³⁺_0.02/Yb³⁺_0.04 nanorod bundle at excitation wavelength of 980 nm. (b) PL mapping image of isolated horizontally positioned single Y_1.94O₃:Ho³⁺_0.02/Yb³⁺_0.04 nanorod bundle. (c) PL intensity distribution along the length of nanorod bundle from one end to other end of nanorod bundle (A to B). (d–f) PL intensity distribution along the diameter of isolated bundle at three different selected positions; left, middle and right sides (A to B), respectively.