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H‐Shaped Oligofluorenes for Highly Air‐Stable and Low‐Threshold Non‐Doped Deep Blue Lasing
Author(s) -
Qian Yan,
Wei Qi,
Del Pozo Gonzalo,
Mróz Marta M.,
Lüer Larry,
Casado Santiago,
CabanillasGonzalez Juan,
Zhang Qi,
Xie Linghai,
Xia Ruidong,
Huang Wei
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201305355
Subject(s) - materials science , lasing threshold , optoelectronics , doping , blueshift , amplified spontaneous emission , laser , optics , photoluminescence , wavelength , physics
H‐shaped oligofluorenes as gain media exhibit excellent photo‐ (large robustness against oxidation) and thermal stabilities in ambient atmosphere for large σ e and low‐threshold (0.22 nJ pulse −1 ) deep blue distributed feedback (DFB) lasers. Their amplified spontaneous emission (ASE) thresholds increase less than 3‐fold and the emission spectra exhibit almost no shift with film samples annealed up to 200 °C in open air.