Intensity morphology dependence

Liu et al. reported the combustion synthesis of 30-50 nm sized luminescent tetragonal YP04 Nd " NPs (Liu et al., 2008b). The obtained NCs exhibited spherical morphology with some agglomeration. The luminescence intensities strongly depended on the concentration of Nd " " and the ratio of urea to... 

Before we leave this section we should note that our explanation of the monomer emission as due to a special pre-formed shallow trap suggests that the low-temperature monomer/excimer emission intensity should be morphology dependent, hence dependent upon sample history, molecular weight, etc. This is indeed the case and we have found that different batches of polymer, aged samples, or samples prepared in different ways than described, may give slightly different intensity ratios at 20K. However, our results for samples prepared as described are completely reproducible and the temperature dependences remain qualitatively the same for deviant samples. 

Jiisten P (1997) Dependence of PenicUlium Chrysogenum growth, morphology, vacuola-tion and productivity on impeller type and agitation intensity. PHD Thesis University of Birmingham... 

Figure 10.3 Dependence of the gradient of the characteristic length scales on the irradiation intensity observed for PSAF/MMA mixtures with different compositions at room temperature. The 2D power spectra corresponding to the morphologies are indicated in the inset.

The PL spectra of the PFs show well-resolved structural features with maxima at 420,445, and 475 nm assigned to the 0-0, 0-1, and 0-2 intrachain singlet transition, respectively (the 0-0 transition, the most intense) [247]. Due to the tail emission spectrum of PFs, the thin films emit bright sky-blue light. The QE of the PFs is very high, typically in the range of 40 to 80% and, as shown for PFO 196, it depends substantially on the morphology of the polymer [248]. 

---