Photo 1 (IMAGE)

National University of Singapore

Photo 1

Caption

Schematic illustration of the photon avalanche mechanism in lanthanide-doped nanocrystals. The process involves ground-state absorption (GSA), followed by excited-state absorption (ESA) and cross-relaxation (CR). A positive feedback loop between ESA and CR leads to an exponential buildup of excited-state population and results in highly nonlinear emission output.

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National University of Singapore

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