Electroluminescence from Phosphor-doped nanocrystals
Alternating current thin-film electroluminescent (ACTFEL) devices already occupy a segment of the largearea, high-resolution, flat-panel-display market. The AC-TFEL displays, which consist of a phosphor layer, such as manganese doped-zinc sulfide (ZnS:Mn), vertically sandwiched between two insulators that are contacted by electrodes, are robust, possess long lifetimes, and offer high luminance with relatively low power consumption [1], [2]. While fabrication of AC-TFEL devices has been the subject of considerable study over the past three decades, significant challenges remain. Development of multicolor displays with balanced red, green, and blue (RGB) emission has proven difficult as the most efficient red, green, and blue phosphors comprise different materials systems that require different deposition and annealing steps. Transparent AC-TFEL displays have recently been demonstrated by Sharp, Inc.; however, the processing of the phosphor to achieve transparency is difficult and has not yet been developed for phosphors other than ZnS:Mn [3].
Efficient emission from core/(doped) shell nanoparticles: applications for chemical sensing.
We have studied manganese doping of zinc selenide core/zinc sulfide shell nanocrystals (NCs) where the impurity phosphor resides primarily in the shell. We have found that a simple two-step synthesis can be used to create these nontoxic materials that display efficient energy transfer from the core to the Mn doped shell. These core/shell NCs retain ample quantum efficiency ( approximately 25%) when solubilized in water, which opens the possibility of using these materials as bioimaging agents. As recent work has shown that nanocrystals can be functionalized with organic dyes to operate as ratiometric chemical sensing agents, we have conjugated the doped NCs with an organic dye to showcase efficient Förster resonant energy transfer from the shell-doped phosphor to the surface-bound dye. This result indicates that doped NCs can be used to develop nontoxic ratiometric sensing/biological imaging agents.
Deviant Women: Female Crime and Criminology in Revolutionary Russia, 1880-1930
This title examines the position of women in early Soviet society through the lens of deviance. After seizing power in 1917, the Bolsheviks initiated reforms aimed at abolishing the old way of life in Russia. A new Family Code liberalized marriage procedures, promoted communal living arrangements, and abolished the concept of illegitimacy. Other decrees legalized abortion, deregulated prostitution, and emancipated women. The Bolsheviks' Marxist ideology that guided these reforms was also behind the assertion that crime, an artifact of bourgeois capitalist exploitation, would disappear under socialism. As crime persisted, Soviet criminologists - a cohort of jurists, doctors, sociologists, anthropologists, psychiatrists, statisticians, and forensic experts - were charged with examining its causes and motives to determine the most effective methods to eliminate it. The problem of female crime occupied a prominent position in criminologists' studies. In explaining 'traditional' female crimes of the domestic sphere - infanticide, spouse murder, and petty theft, among others - criminologists pointed to the offenders' backwardness and ignorance, material circumstances, and even biology. Kowalsky examines the position of women in early Soviet society through the lens of deviance, exploring how Soviet criminologists understood female crime and how their attitudes helped shape the development of Soviet social and behavioral norms. "Deviant Women" looks at the emergence of criminology in early Soviet Russia, tracing the development of principles and theories - in particular of female deviance - and highlighting the ways in which criminologists were able to conduct innovative social science research under the constraints of Bolshevik ideology. Kowalsky then focuses on the analyses of female crime and criminologists' attitudes concerning sexuality, geography, and class. Concluding with a close study of infanticide, the most 'typical' crime committed by women, Kowalsky discusses the social attitudes that were revealed in the professional discussion of this crime. Historians of modern Russia and the USSR, scholars of gender studies, and those studying criminology will be fascinated by this original study.