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Optically Pumped Intensive Light Amplification from a Blue Oligomer.

Mamduh J Aljaafreh¹, Saradh Prasad^2,3, Mohamad S AlSalhi^4,5

¹Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia. maljaafreh@ksu.edu.sa.

|September 25, 2019

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We studied laser action in a conductive oligomer (CO), 1,4-Bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF). This material exhibits efficient amplified spontaneous emission (ASE) with low threshold and high stability, making it promising for optical applications.

Area of Science:

Materials Science
Organic Electronics
Spectroscopy

Background:

Conductive oligomers (COs) are crucial in organic electronics.
Understanding their photophysical properties is key to developing new optoelectronic devices.
1,4-Bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) is a CO with potential laser applications.

Purpose of the Study:

To investigate the time-resolved dynamics of laser action in BECV-DHF.
To analyze the influence of solvents and concentration on BECV-DHF's optical properties.
To evaluate the amplified spontaneous emission (ASE) characteristics and stability of BECV-DHF.

Main Methods:

Absorption and fluorescence spectroscopy in various solvents and concentrations.
Fourier-transform infrared spectroscopy (FTIR) and Ultraviolet-Visible (UV-VIS) spectroscopy (experimental and simulated).

Keywords:

TD-DFT amplified spontaneous emission (ASE)conductive oligomer (CO) 1,4-Bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF)time resolved spectroscopy (TRS)

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Time-resolved spectroscopy (TRS) to study laser dynamics.

Main Results:

BECV-DHF forms dimers in nonpolar solvents, dissolves in polar protic solvents, and aggregates in polar aprotic solvents.
Efficient ASE at 464 nm was observed in most solvents, attributed to waveguiding and self-assembly.
Low threshold pump energy (~0.5 mJ), high ASE efficiency (~20%), and Gaussian temporal output were recorded. High stability compared to PFO-co-pX.

Conclusions:

BECV-DHF exhibits efficient ASE due to its unique self-assembly and waveguiding properties.
The material's performance is solvent-dependent, with no ASE in polar protic solvents.
BECV-DHF demonstrates superior stability and low threshold energy, indicating its potential for laser applications.