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Pyrene‐Capped Conjugated Amorphous Starbursts: Synthesis, Characterization, and Stable Lasing Properties in Ambient Atmosphere
Author(s) -
Xu Weidong,
Yi Jianpeng,
Lai WenYong,
Zhao Li,
Zhang Qi,
Hu Wenbo,
Zhang XinWen,
Jiang Yi,
Liu Ling,
Huang Wei
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501337
Subject(s) - materials science , lasing threshold , pyrene , photoluminescence , thermal stability , amorphous solid , annealing (glass) , amplified spontaneous emission , laser , conjugated system , optoelectronics , crystallization , chemical engineering , photochemistry , polymer , optics , organic chemistry , composite material , chemistry , engineering , wavelength , physics
A family of trigonal starburst conjugated molecules (TrFPy, TrFPy, and TrF2Py) composed of a truxene core and pyrene cappers with various bridge lengths is synthesized and characterized. The incorporation of pyrene cappers successfully depress the crystallization tendency, resulting in enhanced glassy temperature and improved morphological stability of the thin films. The high photoluminescence yield in neat films and excellent thermal stability render these pyrene‐capped starbursts promising lasing optical gain media. Low amplified spontaneous emission (ASE) thresholds ( E th ASE ) of 180 nJ pulse ‐1 and 101 nJ pulse –1 were recorded for TrFPy and TrF2Py, respectively. One dimensional distributed feedback (1D DFB) lasers demonstrated lasing threshold of 9.3 kW/cm 2 and 7.3 kW/cm 2 for TrFPy (at 457 nm) and TrF2Py lasers (at 451 nm), respectively. The ASE performance of TrFPy and TrF2Py in an ambient condition was recorded with various annealing temperature (from 80 to 250 °C, 10 min). Surprisingly, TrFPy exhibited excellent ASE stability in an ambient condition, which is still detectable even after annealing at 250 °C for 10 min. The results suggest the pyrene‐capped molecular design strategy is positive on improving the optical gain stability and meanwhile maintaining excellent lasing properties.