Abstract
In the present work, Yb3+/Ho3+ co-doped Ca12Al14O33 phosphor has been synthesized and upconversion (UC) fluorescence has been studied by pumping the sample with 976 nm radiation. In addition to a strong UC fluorescence due to Ho3+, an avalanche effect is also observed with an increase in input laser power. At a certain threshold power, optical switching (a switching in emission intensity of different transitions) behavior is observed whose response time has been estimated to be of the order of milliseconds. A substantial heat generation inside the host matrix due to electronâphonon coupling (non-radiative relaxations) of the rare-earth ion and the host matrix has been assigned responsible for the switching phenomenon. The heat generation has been confirmed and estimated using fluorescence intensity ratio (FIR) method.
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