Excitation wavelength dependent photoluminescence intensity of six faceted prismatic ZnO microrods

Investigation of the Amplified Spontaneous Emission Threshold of Cesium Lead Bromide Perovskite Quantum Dots at Different Excitation Wavelengths

“…Thus, the absorption spectrum behavior and the E g value indicate that the CsPbBr 3 PQD product is well crystallized, as also shown in the XRD analysis and from the image of TEM, and thus expected to have excellent optical quality. 75 The inset of Fig. 2 shows the absorption behavior between 305-505 nm to compare later with the excitation spectrum in the same range.…”

“…3b, it can be seen that the behavior of PL intensity is dependent on the behavior of the excitation spectrum intensity. 75,83 Figure 3b shows that the λ em is independent of the λ ex , but the intensity of PL can change depending on the distinction within the wavelength of excitation. So normally we take the absorption maximum as the excitation wavelength, but we can also excite the sample at other absorption bands and check the excitation wavelength that gives us the maximum emission intensity, always checking that the excitation energy should be higher than the band gap.…”

“…The relation of the PL intensity on the pump frequency shows that ASE appears effortlessly at all excitation wavelengths. 75 The corresponding results of the laser experiments depend on the excitation wavelengths as follows. The comparison of the wavelength dependence of PL at low and high energy for CsPbBr 3 perovskite QD films for different excitation wavelengths showed that the ASE also appeared effortlessly for all excitation wavelengths.…”