What is the reason for decrease in PL intensity of Hydroxyapatite doped metal ions?

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Tuhin Khan

Decrease in intensity in presence metal ions could be a case of large spin-orbit coupling (SOC) constant. SOC promotes ISC and thereby the emission decreases. This phenomenon is also called heavy metal effect.

http://www.lsc-international.org/conf/pfiles/lsc1966_069.pdf

In addition to this, first row transition metals have low lying vacant metal centered (d-d) state. Low lying vacant orbitals increase the probability of non-radiative transition and thereby have low emission.

Helen Kas

Thank you Tuhin Khan