Pan Y X, Liu G K
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA.
Opt Lett. 2008 Aug 15;33(16):1816-8. doi: 10.1364/ol.33.001816.
The luminescence efficiency of Mn4+-doped CaAl12O19 (Mn:CAO) is significantly improved by composition modification. The leading mechanism that quenches the Mn4+ photoluminescence is the formation of Mn4+ pairs in the lattice of CaAl12O19 (CAO) with interstitial O2- for charge compensation. Mixing Mg2+ ions into the CAO lattice may form Mn4+-Mg2+ pairs and reduce the number of Mn4+ pairs, thus enhancing the Mn4+ luminescence efficiency by more than three times. It is shown that the presence of Mg2+ leads to formation of additional phases that also affect the optical properties of Mn4+.
通过成分改性，掺锰4+的铝酸钙（Mn:CAO）的发光效率得到显著提高。淬灭锰4+光致发光的主要机制是在铝酸钙（CAO）晶格中，间隙氧离子O2-为电荷补偿而形成锰4+对。将镁离子Mg2+混入CAO晶格中可能形成锰4+-镁2+对，并减少锰4+对的数量，从而使锰4+发光效率提高三倍以上。结果表明，镁离子Mg2+的存在会导致额外相的形成，这也会影响锰4+的光学性质。
