scholarly journals Excitation Density Dependence of Optical Oxygen Sensing in Poly(9,9-dioctylfluorene) Waveguides Showing Amplified Spontaneous Emission

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
M. Anni ◽  
S. Lattante
Keyword(s):  
Density Dependence ◽  
Decay Rate ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Detection Sensitivity ◽  
Excitation Density ◽  
Main Process ◽  
Sensitivity Improvement ◽  
Emission Quenching ◽  
Fast Increase

Reversible oxygen induced emission quenching of both the Spontaneous Emission (SE) and the Amplified Spontaneous Emission (ASE) of poly(9,9-dioctylfluorene) waveguides is demonstrated. We show that ASE shows a stronger quenching than SE, up to about 6.2 times, but also a stronger decrease when the excitation density increases. We conclude that the fast increase of the ASE decay rate is the main process in determining the ASE detection sensitivity, limiting the potentiality of sensitivity improvement of ASE with respect to SE.

scholarly journals Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 2992
Author(s):  
Stefania Milanese ◽  
Maria Luisa De Giorgi ◽  
Marco Anni
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Pump Intensity ◽  
Accurate Estimate ◽  
Excitation Density ◽  
Spectral Linewidth ◽  
Line Narrowing ◽  
Order Of Magnitude ◽  
Emission Threshold

Amplified Spontaneous Emission (ASE) threshold represents a crucial parameter often used to establish if a material is a good candidate for applications to lasers. Even if the ASE properties of conjugated polymers have been widely investigated, the specific literature is characterized by several methods to determine the ASE threshold, making comparison among the obtained values impossible. We quantitatively compare 9 different methods employed in literature to determine the ASE threshold, in order to find out the best candidate to determine the most accurate estimate of it. The experiment has been performed on thin films of an homopolymer, a copolymer and a host:guest polymer blend, namely poly(9,9-dioctylfluorene) (PFO), poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) and F8BT:poly(3- hexylthiophene) (F8BT:rrP3HT), applying the Variable Pump Intensity (VPI) and the Variable Stripe Length (VSL) methods. We demonstrate that, among all the spectral features affected by the presence of ASE, the most sensitive is the spectral linewidth and that the best way to estimate the ASE threshold is to determine the excitation density at the beginning of the line narrowing. We also show that the methods most frequently used in literature always overestimate the threshold up to more than one order of magnitude.

Effect of Molecular Morphology on Amplified Spontaneous Emission of Bis-Styrylbenzene Derivatives

2009 ◽  
Vol 21 (40) ◽  
pp. 4034-4038 ◽  
Author(s):  
Ryota Kabe ◽  
Hajime Nakanotani ◽  
Tomo Sakanoue ◽  
Masayuki Yahiro ◽  
Chihaya Adachi
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Molecular Morphology

scholarly journals Origin of Intramolecular Low‐Threshold Amplified Spontaneous Emission

2021 ◽  
pp. 2001956
Author(s):  
Qi Wei ◽  
Ruihong Duan ◽  
Qi Zhang ◽  
Linghai Xie ◽  
Ruidong Xia ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Low Threshold

Conformationally restricted 2,5-diphenyloxazoles: failure of the electromer model for anomalous amplified spontaneous emission spikes

2006 ◽  
Vol 104 (5-7) ◽  
pp. 957-969 ◽  
Author(s):  
J. Saltiel ◽  
R. A. Ivanov ◽  
D. A. Gormin ◽  
T. S. R. Krishna ◽  
R. J. Clark
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Conformationally Restricted

Amplified Spontaneous Emission of Organic Pyridinium Dye doped Polymeric Waveguide

2009 ◽  
Vol 26 (1) ◽  
pp. 017803 ◽  
Author(s):  
Xi Jun ◽  
Ye Li-Hua ◽  
Wang Qiong ◽  
Xu Deng ◽  
Lu Chang-Gui ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Polymeric Waveguide

Efficient Two-Photon Excited Amplified Spontaneous Emission from Organic Single Crystals

ChemPhysChem ◽  
2010 ◽  
pp. n/a-n/a
Author(s):  
Hong Xia ◽  
Jie Yang ◽  
Hong-Hua Fang ◽  
Qi-Dai Chen ◽  
Hai-Yu Wang ◽  
...  
Keyword(s):  
Single Crystals ◽  
Spontaneous Emission ◽  
Amplified Spontaneous Emission ◽  
Two Photon
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