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Stimulated emission from PbS‐quantum dots in glass matrix
Author(s) -
Yue Fangyu,
Tomm Jens W.,
Kruschke Detlef,
Glas Peter
Publication year - 2013
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201200075
Subject(s) - quantum dot , photoluminescence , excitation , auger effect , spontaneous emission , radiative transfer , materials science , density matrix , atomic physics , luminescence , range (aeronautics) , laser , quantum efficiency , molecular physics , auger , optoelectronics , quantum , physics , optics , quantum mechanics , composite material
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 µJ/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 µ J/cm 2 per pulse at 390 nm excitation and increases the external quantum efficiency. The time constant of this process is ∼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.