Abstract
The upconversion efficiency depends on the pump power density. Materials exhibiting a high upconversion efficiency under high pump power density do not necessarily have a reasonable upconversion efficiency under the pump power density around that of the concentrated sunlight. Also, materials which have an upconversion efficiency not so high under high pump power density do not necessarily have no practical upconversion efficiency under the pump power density of concentrated sunlight. To avoid the inconveniences in measuring the upconversion efficiency under the pump power density of concentrated sunlight which is very weak, a method which can evaluate the significance of upconversion materials for solar cells is proposed.
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