TPV spectroscopy of (a) the undoped ZnSe QDs (a1), the Mn-doped ZnSe QDs (a2); (b) the undoped QDSTF (b1), and the Mn-doped QDSTF (b2). Inset in (b) illustrates the home-build setup for TPV spectrum measurement, where the sample was illuminated by a laser with a wavelength of 355 nm and an intensity of 20 μJ. |