Compositions – Inorganic luminescent compositions – Zinc or cadmium containing
Reexamination Certificate
2008-07-29
2008-07-29
Koslow, C. Melissa (Department: 1793)
Compositions
Inorganic luminescent compositions
Zinc or cadmium containing
C252S30160S, C252S06230Q, C252S06230R, C257S043000, C257S102000, C257S078000
Reexamination Certificate
active
07404913
ABSTRACT:
Fast, bright inorganic scintillators at room temperature are based on radiative electron-hole recombination in direct-gap semiconductors, e.g. CdS and ZnO. The direct-gap semiconductor is codoped with two different impurity atoms to convert the semiconductor to a fast, high luminosity scintillator. The codopant scheme is based on dopant band to dopant trap recombination. One dopant provides a significant concentration of carriers of one type (electrons or holes) and the other dopant traps carriers of the other type. Examples include CdS:In,Te; CdS:In,Ag; CdS:In,Na; ZnO:Ga,P; ZnO:Ga,N; ZnO:Ga,S; and GaN:Ge,Mg.
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Bourret-Courchesne Edith
Derenzo Stephen Edward
Klintenberg Mattias K.
Weber Marvin J.
Caron R'Sue Popowich
Chiang Robin Chan
Koslow C. Melissa
Lawrence Berkeley National Laboratory
The Regents of the University of California
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