Subresonantly excited Nd3+ fluorescence in LiLa1−xNdxP4O12 nanocrystals

- Subresonantly pumped fluorescence of LiLa1−xNdxP4O12 nanocrystals was observed.
- It was affected by excitation power and dopant concentration.
- It occurs due to concentration dependent thermal population of 4I11/2 term via Z5.
- The subresonantly pumped fluorescence is in its nature a cooperative-like process.