Indication of current-injection lasing from an organic semiconductor

Sandanayaka, Atula S. D.; Matsushima, Toshinori; Bencheikh, Fatima; Terakawa, Shinobu; Potscavage, William J.; Qin, Chuanjiang; Fujihara, Takashi; Goushi, Kenichi; Ribierre, Jean Charles; Adachi, Chihaya

doi:10.7567/1882-0786/ab1b90

Cited by 234 publications

(310 citation statements)

References 31 publications

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“…is the plasma frequency and  is the free carrier damping. The plasma frequency is written as = * (17) In this expression N is the number of charges, e the electron charge, * the effective mass and the vacuum dielectric constant. For FICO, we use = 1.68 × 10 ℎ ⁄ and * = 0.43 ⁄ , a free carrier damping Γ = 0.07, and a high frequency dielectric constant, = 5.6, is taken from [33,34].…”

Section: Resultsmentioning

confidence: 99%

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Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Scotognella

2020

Physica E: Low-dimensional Systems and Nanostructures

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We design photonic structures embedding different functional molecular systems of photochromic switching and lasing. We study the light absorption of two photochromic molecules and of 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) with density functional theory. For the photochromic diarylethene we derivate the refractive index with Kramers-Kronig relations and we design multilayer photonic structures alternating diarylethene with either poly vinyl carbazole or fluorine indium co-doped cadmium oxide (FICO) nanoparticlebased layers. For BSB-Cz we design a one-dimensional photonic crystal alternating BSB-Cz layers wit SiO2 layers and a microcavity embedding BSB-Cz between indium tin oxide (ITO) / FICO nanoparticle-based multilayers.

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Section: Resultsmentioning

confidence: 99%

“…In this work we design multilayer photonic crystals and microcavities including two photochromic molecules reported in Refs. [15,16] and 4,4'-bis[(N-carbazole)styryl]biphenyl (BSB-Cz) [17] one of the most promising optical gain molecules. We study the optical properties of the three molecules with density functional theory.…”

Section: Introductionmentioning

confidence: 99%

Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Scotognella

2020

Physica E: Low-dimensional Systems and Nanostructures

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“…However, in many cases, the lower luminance of OLEDs relative to, e.g., inorganic GaN LEDs represents a challenge, in particular as the driving voltage available from CMOS chips is limited (often to 5 V) . Applications that would benefit from OLEDs with increased luminance include visible‐light communication, lasers, or biomedical uses, e.g., in cancer treatment through photodynamic therapy, sensors, imaging, and most recently optogenetics, which is an emerging neuroscience technology that allows optical activation and silencing of genetically modified nerve cells with great specificity . In many of these areas, the desired luminance is orders of magnitude higher than for displays and even general illumination.…”

Section: Introductionmentioning

confidence: 99%

Development of Very High Luminance p–i–n Junction‐Based Blue Fluorescent Organic Light‐Emitting Diodes

Deng

Murawski

Keum

et al. 2020

Advanced Optical Materials

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Organic light‐emitting diodes (OLEDs) can emit light over much larger areas than their inorganic counterparts, offer mechanical flexibility, and can be readily integrated on various substrates and backplanes. However, the amount of light they emit per unit area is typically lower and the required operating voltage is higher, which can be a limitation for emerging applications of OLEDs, e.g., in outdoor and high‐dynamic‐range displays, biomedical devices, or visible‐light communication. Here, high‐luminance, blue‐emitting (λpeak = 464 nm), fluorescent p–i–n OLEDs are developed by combining three strategies: First, the thickness of the intrinsic layers in the device is decreased to reduce internal voltage loss. Second, different electron‐blocking layer materials are tested to recover efficiency losses resulting from this thickness reduction. Third, the geometry of the anode contact is optimized, which leads to a substantial reduction in the in‐plane resistive voltage losses. The OLEDs retain a maximum external quantum efficiency of 4.4% as expected for an optimized fluorescent device and reach a luminance of 132 000 cd m−2 and an optical power density of 2.4 mW mm−2 at 5 V, a nearly eightfold improvement compared to the original reference device.

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“…[6,7] Despite recent advances in optically pumped organic lasing, [8][9][10][11] achieving electrically pumped organic lasing still remains ac ritical challenge. [12] The realization of electrically pumped lasing requires gain media with high charge mobility,h igh gain properties, and excellent thermal and optical stability,e tc. [13] Althoughi mportant advances have been achievedi nO LEDs, most organic emitters commonly suffer from inferior charge transport and optical stabilityf or electrically pumped OSLs.…”

Section: Introductionmentioning

confidence: 99%

Donor–Acceptor Type Pendant Conjugated Molecules Based on a Triazine Center with Depressed Intramolecular Charge Transfer Characteristics as Gain Media for Organic Semiconductor Lasers

Liu

Sang

et al. 2020

Chemistry A European J

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A set of fluorene‐capped pendant conjugated molecules (T‐m and T‐p), which consist of a triazine center with three carbazole substituents as the donor–acceptor (D‐A) type pendant structure, were designed, synthesized, and investigated as gain media for organic semiconductor lasers (OSLs). In particular, varying the capping positions of the fluorene units on the pendant core structures results in significantly different intramolecular charge transfer (ICT) properties, where T‐m manifested depressed ICT characteristic and high fluorescence quantum yield. The lowest amplified spontaneous emission (ASE) threshold in neat films was recorded as 1.9 μJ cm−2 for T‐m and 83.8 μJ cm−2 for T‐p, which indicated that the depressed ICT characteristics in the case of T‐m help to enhance the ASE properties. Remarkably, the ASE threshold remained almost unchanged and the ASE spectra showed very small shifts (within 1 nm) for T‐m with film samples annealed up to 180 °C in open air. In contrast, its linear counterpart 2FEtCz‐m showed a clearly increased ASE threshold upon annealing above 100 °C. The results suggest that the selective construction of conjugated pendant molecules with depressed ICT characteristics is beneficial for finely modulating the optical and electrical properties as well as improving the thermostability and photostability, which manifests the great potential as a robust gain media for OSLs.

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Indication of current-injection lasing from an organic semiconductor

Cited by 234 publications

References 31 publications

Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Multilayer plasmonic photonic structures embedding photochromic molecules or optical gain molecules

Development of Very High Luminance p–i–n Junction‐Based Blue Fluorescent Organic Light‐Emitting Diodes

Donor–Acceptor Type Pendant Conjugated Molecules Based on a Triazine Center with Depressed Intramolecular Charge Transfer Characteristics as Gain Media for Organic Semiconductor Lasers

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