The phenomenon of upconversion is an optical process that takes in lower energy (longer wavelength) photons and emits higher energy (shorter wavelength) photons. It relies on the presence of multiple long
lived metastable states, which can be found in lanthanide materials. The use of the upconversion phenomenon encompasses bioimaging, where the longer wavelength excitation is advantageous, to
photovoltaics, where it can be used to enhance collection efficiency. In this note emission from lanthanide containing glasses in the visible wavelength range is studied upon excitation in the near infrared
(NIR) using a DeltaDiode laser (DD‐980L) on a DeltaFlex system. The DeltaDiode sources with subnanosecond pulse widths are used in a new way to detect longer lifetimes such as microsecond to
milliseconds, as found in upconverting materials such as photovoltaics and lanthanide-doped glasses.
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