In this chapter an attempt is made to study the Einstein's Photoemission(EP) from Quantum Dots(QDs) of non-linear optical, III-V, II-IV, n-GaP, n-Ge, Te, Graphite, PtSb2, zero gap, II-V, GaSb, stressed materials,Bi, IV-IV, Lead germanium telluride, Zinc and Cadmium diphosphides, Bi2Te3 and Antimony on the basis of respective carrier energy spectrum. We have also investigated the EP from III-V,II-VI,IV-VI and HgTe/CdTe Quantum Dot Superlattices(QDSL) with graded interfaces together with the QD effective mass superlattices of the afore mentioned materials. It has been found taking QDs of n- Cd Ge As2, n-GaAs, CdS, GaP, Ge, Te, PtSb2, HgTe, Pb1-xGaxTe, GaSb, stressed InSb, Bi, PbTe, CdSb, CdP2, ZnP2 Bi 2 Te 3 and Sb as example that the EP increases with increasing carrier degeneracy and decreasing film thickness exhibiting spikes for specified values of the said variables and also increases with increasing photo energy in a step like manner exhibiting signature of the 3D quantization of the wave vector space of the carrier in each case. The EP from HgTe/CdTe,HgTe/Hg 1-x Cd x Te, CdS/ZnSe and PbSe/PbTe QDSL with graded interfaces and QD effective mass SLs of the said compounds increases with increasing electron concentration, shows oscillatory dependence with increasing film thickness and increases with increasing photon energy in quantum step fashion. The appearance of the humps of the respective curves is due to the redistribution of the electrons among the quantized energy levels when the quantum numbers corresponding to the highest occupied level changes from one fixed value to the others. Although the EP varies in various manners with all the variables as evident from all the curves, the rates of variations totally depend on the specific dispersion relation of the particular 3D structure. Under certain limiting conditions, the results as derived in this chapter get transformed in to well known formulas of the EP and the electron statistics and thus confirming the compatibility test. The contents of this chapter find two applications in the field of quantized structures. © 2013 by Nova Science Publishers, Inc. All rights reserved.