Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission

Gediminas Kreiza, Paulius Baronas, Edvinas Radiunas, Povilas Adomėnas, Ona Adomėnienė, Karolis Kazlauskas, Jean Charles Ribierre, Chihaya Adachi, Saulius Juršėnas

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Organic single crystals offering numerous advantages due to their long-range molecular order are considered a promising gain medium for realization of electrically-pumped organic lasers provided their amplified spontaneous emission (ASE) threshold is sufficiently low. Unfortunately, ASE thresholds of such crystals are typically more than one order of magnitude higher (in the range of tens of kW cm−2) as compared to those of amorphous neat/doped films. Here, this issue is addressed by rationally designing bifluorene-based compounds to express weak intermolecular coupling in the crystalline phase. The twisted molecular backbone as well as out-of-plane twisted dimethyl moieties attached at the fluorene end-groups additionally benefit with enhanced electron–vibronic coupling resulting in a large Stokes shift (0.5 eV) and reduced reabsorption of emission. Endowed with such features the bifluorenes exhibit similarly high radiative decay rates (≈1.5 × 109 s−1) when doped in polystyrene matrix at low concentrations and in sublimation-grown single crystals. The high radiative rates accompanied by excellent waveguiding properties, favorable orientation of transition dipole moments as well as non-overlapping excited-state absorption and gain regions enable achieving extremely low ASE thresholds (≈700 W cm−2) in the bifluorene single crystals. The achieved low threshold encourages employment of rationally designed molecules in organic crystals for lasing applications.

Original languageEnglish
Article number1600823
JournalAdvanced Optical Materials
Volume5
Issue number5
DOIs
Publication statusPublished - Mar 3 2017

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Spontaneous emission
spontaneous emission
Single crystals
thresholds
single crystals
Organic lasers
Crystals
Sublimation
Polystyrenes
Dipole moment
organic lasers
Electron transitions
Excited states
sublimation
decay rates
Crystalline materials
crystals
lasing
low concentrations
polystyrene

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Kreiza, G., Baronas, P., Radiunas, E., Adomėnas, P., Adomėnienė, O., Kazlauskas, K., ... Juršėnas, S. (2017). Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission. Advanced Optical Materials, 5(5), [1600823]. https://doi.org/10.1002/adom.201600823

Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission. / Kreiza, Gediminas; Baronas, Paulius; Radiunas, Edvinas; Adomėnas, Povilas; Adomėnienė, Ona; Kazlauskas, Karolis; Ribierre, Jean Charles; Adachi, Chihaya; Juršėnas, Saulius.

In: Advanced Optical Materials, Vol. 5, No. 5, 1600823, 03.03.2017.

Research output: Contribution to journalArticle

Kreiza, G, Baronas, P, Radiunas, E, Adomėnas, P, Adomėnienė, O, Kazlauskas, K, Ribierre, JC, Adachi, C & Juršėnas, S 2017, 'Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission', Advanced Optical Materials, vol. 5, no. 5, 1600823. https://doi.org/10.1002/adom.201600823
Kreiza G, Baronas P, Radiunas E, Adomėnas P, Adomėnienė O, Kazlauskas K et al. Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission. Advanced Optical Materials. 2017 Mar 3;5(5). 1600823. https://doi.org/10.1002/adom.201600823
Kreiza, Gediminas ; Baronas, Paulius ; Radiunas, Edvinas ; Adomėnas, Povilas ; Adomėnienė, Ona ; Kazlauskas, Karolis ; Ribierre, Jean Charles ; Adachi, Chihaya ; Juršėnas, Saulius. / Bifluorene Single Crystals with Extremely Low-Threshold Amplified Spontaneous Emission. In: Advanced Optical Materials. 2017 ; Vol. 5, No. 5.
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