(a) Schematic diagram of the setup for PL measurements in this study. (b) Plan-view bright-field HRTEM image of the ZnO nanoparticles embedded in the hybrid polymer matrix.
PL spectra at for PVK, sample 1 (ZnO/BPDA-PDA PI), and sample 2 [ZnO/(BPDA-PDA )]. The dashed, the dotted, and the solid lines represent the PL data for PVK, sample 1, and sample 2, respectively.
(a) PL spectra measured at several temperatures for sample 2 [ZnO/(BPDA-PDA )] and (b) typical Gaussian-fitting analysis of the PL spectrum at .
Integrated PL intensities of the UV, the deep blue, and the green emissions as functions of the reciprocal temperature for sample 2 [ZnO/(BPDA-PDA )]. The circles, the triangles, and the solid rectangles represent the data for the deep blue, the green, and the UV emissions, respectively.
Energy-level diagram showing the UV transition for the ZnO/(BPDA-PDA ) hybrid system. The LUMO and the HOMO represent the energy levels of the highest occupied molecular orbital and the lowest unoccupied molecular orbital of the PVK and the PI, respectively.
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