Blue light emitting diode with 1,1,4,4-tetraphenyl-1,3-butadiene (TPB)

Kim, Jung-Hyun; Noh, Sokwon; Kim, Kwanju; Lim, Sang Hoon; Shin, Dong-Myung

doi:10.1016/s0379-6779(00)00370-2

Cited by 19 publications

(11 citation statements)

References 4 publications

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“…These contribute to the broad emission and to the shoulder at about 2.75 eV observed in the cw spectra. We point out that the PL data reported in the literature [18][19][20][21][22][23][24] do not allow distinguishing between the intrinsic emissions and the emission from defect states, the observed PL being typically unpolarized, relatively broad, and centred between about 2.7 and 2.8 eV, depending on the sample.…”

Section: Spontaneous and Amplified Spontaneous Emissionmentioning

confidence: 78%

“…[15][16][17] Among the many organic semiconductor systems, 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) (molecular structure in Figure 1) is a well-known, highly emissive molecule, which is attracting wide attention as an electro-active molecule. It is often used as blue electroluminescent dye [18][19][20][21] or as highenergy emitter in organic white-light emitting devices. [22,23] Furthermore, it can be deposited in thin film form on different substrates.…”

Section: à2mentioning

confidence: 99%

“…[22,23] Furthermore, it can be deposited in thin film form on different substrates. [18][19][20][21][22] The photoluminescence (PL) properties of the TPB molecules in solution and in optically transparent polymeric matrices have been investigated both experimentally [24] and theoretically, [25] and the emission spectrum of TPB-based devices is reported by many authors, with maximum typically found at 2.7-2.8 eV and relatively high emission quantum yield. [18,19,21,23,24] Interestingly for both applications and for the comprehension of the intrinsic properties, TPB forms single crystals.…”

Section: à2mentioning

confidence: 99%

“…[18][19][20][21][22] The photoluminescence (PL) properties of the TPB molecules in solution and in optically transparent polymeric matrices have been investigated both experimentally [24] and theoretically, [25] and the emission spectrum of TPB-based devices is reported by many authors, with maximum typically found at 2.7-2.8 eV and relatively high emission quantum yield. [18,19,21,23,24] Interestingly for both applications and for the comprehension of the intrinsic properties, TPB forms single crystals. However, most of the reported optical measurements are for TPB polycrystalline films, which are mainly limited to emission [18,19,21,23,24] and with little discussion on the origin of the observed transitions.…”

Section: à2mentioning

confidence: 99%

“…[18,19,21,23,24] Interestingly for both applications and for the comprehension of the intrinsic properties, TPB forms single crystals. However, most of the reported optical measurements are for TPB polycrystalline films, which are mainly limited to emission [18,19,21,23,24] and with little discussion on the origin of the observed transitions.…”

Section: à2mentioning

confidence: 99%

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Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

et al. 2010

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Blue amplified spontaneous emission at room temperature is demonstrated from the exposed face of the strongly emitting organic semiconductor 1,1,4,4-tetraphenyl-1,3-butadiene in single crystal form. The symmetry of the crystal and calculation of lattice sums indicate the J-type organization of the molecular transition moments. The minimum in the lowest exciton dispersion branch, from which emission takes place, is found at the edge of the Brillouin zone leading to a dominant vibronic emission since the zero-phonon line is forbidden. The observed gain narrowed line is attributed to the vibronic replica which becomes amplified with increased pumping. The reported emission is along the normal to the exposed crystal face, important for the development of vertical cavity geometry lasers based on organic single crystals. The threshold excitation fluence of 400 microJ cm(-2) is comparable to other organic crystalline systems, even if the amplification path is much reduced as a consequence of the vertical geometry. Considering these relevant aspects, the optical characterization of this material is provided. The polarized absorption spectra are reported and the properties of the lowest-energy excitonic state investigated. Calculation of the electronic transitions for the isolated molecule, lattice sums for the transition at lowest energy, and the symmetry of the crystal allow attributing the largest face of the samples and the observed optical bands in the spectra. Polarized time-resolved spectra are also reported allowing to identify the intrinsic excitonic emission.

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Section: Spontaneous and Amplified Spontaneous Emissionmentioning

confidence: 78%

Section: à2mentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

Section: à2mentioning

confidence: 99%

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Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

et al. 2010

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Palladium‐Catalyzed Intermolecular Three‐Component Coupling of Organic Halides with Alkynes and Alkenes: Efficient Synthesis of Oligoene Compounds

2007

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The intermolecular three-component coupling of aryl or vinyl halides, diarylacetylenes, and monosubstituted alkenes effectively proceeds in the presence of palladium acetate, lithium chloride, and sodium bicarbonate as catalyst, promoter, and base, respectively, in aqueous DMF or DMSO to produce the corresponding 1,3-butadiene or 1,3,5-hexatriene derivatives. Use of dienyl bromides allows the coupling to afford 1,3,5,7-octatetraenes. Under the present catalytic conditions, fulvene derivatives are also formed efficiently by the 1:2 coupling of vinyl bromides and diarylacetylenes without adding the alkenes.

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Palladium/Phosphite or Phosphate Catalyzed Oxidative Coupling of Arylboronic Acids with Alkynes to Produce 1,4‐Diaryl‐1,3‐butadienes

et al. 2008

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Blue light emitting diode with 1,1,4,4-tetraphenyl-1,3-butadiene (TPB)

Cited by 19 publications

References 4 publications

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

Polarized Absorption, Spontaneous and Stimulated Blue Light Emission of J‐type Tetraphenylbutadiene Monocrystals

Palladium‐Catalyzed Intermolecular Three‐Component Coupling of Organic Halides with Alkynes and Alkenes: Efficient Synthesis of Oligoene Compounds

Palladium/Phosphite or Phosphate Catalyzed Oxidative Coupling of Arylboronic Acids with Alkynes to Produce 1,4‐Diaryl‐1,3‐butadienes

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