期刊
LASER & PHOTONICS REVIEWS
卷 7, 期 1, 页码 L1-L5出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201200075
关键词
Stimulated emission; PbS quantum dots; glass matrix; laser
资金
- NSFC [60906043]
- SRF for the Doctoral Program of Higher Education of China [20090076120010]
The luminescence behavior of PbS-quantum dots in glass matrix (PbS:Glass) is investigated. Steady-state and time-resolved photoluminescence are applied in a wide range of excitation densities up to pulse energies exceeding 50 mu J/cm(2). While perfect linear recombination is observed across four orders of magnitude, an additional radiative recombination mechanism emerges at an excitation density of 1 mu J/cm(2) per pulse at 390 nm excitation and increases the external quantum efficiency. The time constant of this process is similar to 20-40 ps. It is ascribed to stimulated emission. No hint to any non-linear non-radiative processes such as Auger recombination is observed. Thermal effects, however, still set limits. This is encouraging news for PbS: Glass as potential laser material.
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