Abstract
Surface-enhanced ZnS: Ag quantum dots scintillator has been manufactured by coupling quantum dots and dendritic silver surface-enhanced substrates. Four-fold enhancement of the fluorescence intensity was achieved compare to the undoped quantum dots without surface-enhanced substrates. Two silicon layers of certain thickness were used to prevent quenching of the fluorescence by monitoring the distance between quantum dots and surface-enhanced substrates. The enhancement results show consistence with theories, and larger enhancement factor is possible to be obtained with optimal preparation procedure. This study suggests a new method to achieve high performance quantum dots scintillator beneficial to radiation detection applications.
Highlights
Fluorescence-based scintillator detector is one of the most widely used neutron detectors.1 lower light yield and poor energy resolution are shortages of scintillator
Some researches proved that ZnS quantum dots doped with Ag under specific conditions have improved luminescence effect
In order to avoid the quenching effect caused by direct attachment, some medium like silicon layer was used for effective coupling
Summary
Fluorescence-based scintillator detector is one of the most widely used neutron detectors.1 lower light yield and poor energy resolution are shortages of scintillator. The quantum dots photoluminescence enhancement is interpreted from the views of temperature and coupled distance.
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