Amplified Spontaneous Emission Properties of Semiconducting Organic Materials

Calzado, Eva M.; Boj, Pedro G.; Díaz-García, María A.

doi:10.3390/ijms11062546

Cited by 52 publications

(34 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 5 shows that when the pumping/excitation energy is increased the output intensity is also increased, however, at a particular energy, the output intensity shows a notable increase in the slope. This particular pumping intensity is known as the "threshold energy (E th )" [33]. The value of E th can also be obtained from the curves showing the emission line width of FWHM versus pumping intensity [34].…”

Section: Resultsmentioning

confidence: 99%

Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

et al. 2019

View full text Add to dashboard Cite

In this paper, we report optical characteristics of an organic single crystal oligomer 5,5 -diphenyl-2,2 :5 ,2"":5",2 :5 ,2 -quinquethiophene (P5T). P5T crystal is a thiophene/phenylene co-oligomer that possesses better charge mobility as well as photoluminescence quantum efficiency (PLQE) as compared to other organic materials. Stimulated emission in P5T is investigated via amplified spontaneous emission (ASE) measurements within broad pump energies ranging from 35.26 to 163.34 µJ/cm 2 . An Nd-YAG femtosecond-tunable pulsed laser is used as a pump energy source for the ASE measurements of P5T crystals at an excitation wavelength of 445 nm. The ASE spectra exhibit optical amplification in P5T crystals at a 625 nm peak wavelength with a lower threshold energy density (E th ) ≈ 52.64 µJ/cm 2 . P5T also demonstrates higher optical gain with a value of 72 cm −1 , that is calculated by using the variable stripe-length method. The value of PLQE is measured to be 68.24% for P5T. This study proposes potential applications of P5T single crystals in organic solid state lasers, photodetectors, and optical amplifiers.

show abstract

Section: Resultsmentioning

confidence: 99%

Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

et al. 2019

View full text Add to dashboard Cite

show abstract

“…), perpendicular spirobifluorene derivatives, pyrene-cored dendrimers, truxene-cored star-shaped macromolecules, perilene diimide derivatives (PDIs), and spiropyran biopolymer system deoxyribonucleic acid (DNA) with high thermal stability and good solubility. 9,[14][15][16][17][18][19][20] Although these organic molecules show significant lasing performances, from the molecular structure point of view, the fundamental mechanism for ASE is absent, making their elucidation a major issue. In theory, previous studies only focused on electronic structures in electronic states, photophysical properties, optical spectra and Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

The molecular picture of amplified spontaneous emission of star-shaped functionalized-truxene derivatives

Zhou

et al. 2015

J. Mater. Chem. C

View full text Add to dashboard Cite

Organic optical gain materials are the basis for organic solid-state lasers. However, the fundamental mechanism for Amplified Spontaneous Emission (ASE) is absent. Herein, three star-shaped molecules based on a truxene core with p-conjugated arms are studied to illuminate the influence of the molecular structure on ASE performance. We found that the three compounds demonstrated different ASE characteristics. The strong conjugated linkage in the molecular arms enhanced ASE, while the attenuated conjugated linkage deteriorates ASE for the given molecular structures. Based on the theoretical analysis, the conjugative coupling suppresses the low-frequency vibration, which is beneficial to the formation of an effective ''four-level'' energy system for ASE. On the contrary, the poor conjugative coupling brings out a mass of low-frequency modes, and hence, continuous vibronic energy sublevels will ruin the molecular ''four-level'' energy system. Our study presented a clear picture to clarify the ASE mechanism and offers valuable guidance for the design of new organic optical gain materials.

show abstract

“…Organic compounds become more useful in light emitting systems like organic light emitting devices (OLED) and organic lasers [1][2][3][4]. Most of them are made from small molecules by thermal evaporation in vacuum or polymers by wet casting methods [1,5] But there is third possible way -to make thin films from small molecules by wet casting methods.…”

Section: Introductionmentioning

confidence: 99%

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Vembris

Pudžs

Muzikante

2012

Organic Photonics V

View full text Add to dashboard Cite

Low molecular mass organic compounds which make thin films from volatile organic solutions would be great benefit in future organic light emitting systems. Two most important advantages could be mentioned. First -the repetition of synthesis of small molecules is better than for polymers. Second -wet casting methods could be used. In this work we are presenting optical, electroluminescence and amplified spontaneous emission properties of four original glassy forming compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene fragment as backbone of the molecule. They has the same N,N-dialkylamino electron donating group with incorporated bulky trityloxy ethyl groups. The difference of these compounds is in electron acceptor group. One has 1H-indene-1,3(2H)-dione group, second has pyrimidine-2,4,6(1H,3H,5H)-trione group, third has malononitrile group and fourth has 2-ethyl-2-cyanoacetate. Absorption maximum of the compounds is between 420 and 500 nm and is red shifted from weaker acceptor group to stronger one. The electroluminescence efficiency for simple device ITO/PEDOT:PSS/Organic compound/BaF/Al is low. For the best one with malononitrile group it was 0.13 cd/A and 0.036 lm/W. It could be increased by optimising the sample geometry or adding addition layers for charge carrier transport and exciton blocking. But nevertheless the use of these compounds in organic light emitting devices in neat films is unlikely. Attached bulky trityloxy ethyl groups and tert-butyl group decrease interaction between the molecules thus allowing to obtain amplified spontaneous emission in neat thin films for all investigated compounds.

show abstract

Amplified Spontaneous Emission Properties of Semiconducting Organic Materials

Cited by 52 publications

References 61 publications

Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

Amplified Spontaneous Emission and Optical Gain in Organic Single Crystal Quinquethiophene

The molecular picture of amplified spontaneous emission of star-shaped functionalized-truxene derivatives

Light-emitting thin films of glassy forming organic compounds containing 2-tert-butyl-6-methyl-4H-pyran-4-ylidene

Contact Info

Product

Resources

About