Electroluminescence of molecularly-doped polymer films using coumarin derivative as an emissive center

Lin, Ching-Piao; Tsutsui, Tetsuo; Saito, Shōgo

doi:10.1007/bf01494248

Cited by 14 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, we synthesized, purified and characterized new nonperipheral coumarino-phthalocyanines (3)(4)(5). All characterization methods such as FT-IR, UV-vis, Maldi-TOF and elemental analyses verified structures of either nitrile or phthalocyanine complexes.…”

Section: Resultsmentioning

confidence: 95%

“…The aromatic protons appeared at 7.58-6.94 ppm, the two methyl protons at the 3-and Scheme 1. Synthetic route of phthalonitrile 2 and the corresponding metallophthalocynanines (3)(4)(5) + of all the complexes. Elemental analyses for nitrile 2 and phthalocyanines (3-5) confirmed their proposed structure.…”

Section: Electrical and Gas Sensing Properties Of Novel Cobalt(ii) Cmentioning

confidence: 99%

“…Compounds containing a coumarin (2H-1-benzopyran-2-one, benzo-annulated oxygen heterocycles) component have been useful in many fields such as nonlinear optical materials [1], fluorescence materials and laser dyes [2], photo refractive materials [3], intermediates for drug synthesis [4] and luminescence materials [5]. In addition, coumarins are biologically relevant heterocyclic compounds with many interesting pharmacological properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

Köksoy

Aygün

Çapkin

et al. 2018

J. Porphyrins Phthalocyanines

View full text Add to dashboard Cite

ABSTRACT:The synthesis of metallophthalocyanines (M = Co, Cu, Mn) bearing four ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties was performed. These novel compounds were characterized by elemental analysis, 1 H-NMR spectroscopy, FT-IR, UV-vis and mass spectral data. DC and AC electrical properties of the films of metallophthalocyanines were investigated in the temperature range of 295-523 K. AC measurements were performed in the frequency range of 40-10 5 Hz. Activation energy values of the films took place between 0.55 eV-0.93 eV. Impedance spectroscopy measurements revealed that bulk resistance decreases with increasing temperature, indicating semiconductor properties. DC conductivity results also supported this result. Their gas sensing properties were also investigated for the vapors of Volatile Organic Compounds (VOCs), n-butyl acetate (200-3200 ppm) and ammonia (7000-56000 ppm) between temperatures 25-100 °C. Sensitivity and response times of the films for the tested vapors were reported. The results were found to be reversible and sensitive to the vapors of n-butyl acetate and ammonia. It was found that Mn(OAc)Pc showed better sensitivity than CoPc and CuPc for n-butyl acetate vapors at all measured vapor concentrations and temperatures. Mn(OAc)Pc also showed better sensitivity than CoPc and CuPc for ammonia vapors at 22 °C.

show abstract

Section: Resultsmentioning

confidence: 95%

Section: Electrical and Gas Sensing Properties Of Novel Cobalt(ii) Cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

Köksoy

Aygün

Çapkin

et al. 2018

J. Porphyrins Phthalocyanines

View full text Add to dashboard Cite

show abstract

“…After that report, a number of sophisticated SOLEDs using various kinds of organic materials were reported in order to improve device performance. [9][10][11][12][13][14] The combination and composition of HTM, ETM, and dopant molecules was found to extensively influence device performance: external EL quantum efficiency ⌽ EL and energy conversion efficiency as well as emission colors. In addition, SOLEDs utilizing various types of active polymer materials have been also reported.…”

Section: Introductionmentioning

confidence: 99%

Charge carrier trapping effect by luminescent dopant molecules in single-layer organic light emitting diodes

Uchida

Adachi

Koyama

et al. 1999

Journal of Applied Physics

209

120

View full text Add to dashboard Cite

Articles you may be interested inDistinguishing triplet energy transfer and trap-assisted recombination in multi-color organic light-emitting diode with an ultrathin phosphorescent emissive layer Determination of traps in poly(p-phenylene vinylene) light emitting diodes by charge-based deep level transient spectroscopyWe investigated electroluminescent ͑EL͒ characteristics of single-layer organic light emitting diodes ͑SOLEDs͒. Our SOLED devices are composed of an inert polymer as a binder, in which hole transport molecules, emissive electron transport molecules ͑ETMs͒, and highly fluorescent dopants as luminescent centers are dispersed. We examined two typical dopants: rubrene and coumarin 6. These exhibited different charge carrier recombination and emission mechanisms. The dopant concentration dependence of the current density-voltage-luminance relationships clearly showed the importance of carrier trapping by dopant molecules for obtaining high luminance. When the dopant was rubrene, we observed that charge carriers were well trapped by the dopant molecule. This means that direct recombination of holes and electrons occurred on the dopant molecules and trapping significantly enhanced the external EL quantum efficiency ⌽ EL . For coumarin 6, on the other hand, we observed that charge carriers primarily recombined at the emissive ETMs and that the energy transfer from the host to the guest coumarin 6 molecule dominated the EL process. A comparison of these distinct processes revealed that carrier trapping by dopant molecules was necessary to enhance ⌽ EL in SOLED devices. In our best SOLED device with rubrene as a dopant, we measured luminance of 2800 cd/m 2 at Jϭ100 mA/cm 2 , which corresponds to ⌽ EL ϭ0.85%.

show abstract

“…Materials containing a coumarin (2H-1-benzopyran-2-one) component have been useful in many fields such as fluorescence materials and laser dyes, [1] nonlinear optical materials, [2,3] photorefractive materials, [4] photo resists, [5,6] intermediates for drug synthesis, [7] luminescence materials, [8,9] etc. Therefore, the preparation of polymers with coumarin moieties has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystalline coumarin polymers, 1. Synthesis and properties of side-group liquid crystalline polymers with coumarin moieties

Tian

Akiyama

et al. 2000

Macromol. Chem. Phys.

View full text Add to dashboard Cite

Electroluminescence of molecularly-doped polymer films using coumarin derivative as an emissive center

Cited by 14 publications

References 19 publications

Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

Charge carrier trapping effect by luminescent dopant molecules in single-layer organic light emitting diodes

Liquid crystalline coumarin polymers, 1. Synthesis and properties of side-group liquid crystalline polymers with coumarin moieties

Contact Info

Product

Resources

About