Para-sexiphenyl-CdSe/ZnS nanocrystal hybrid light emitting diodes

Simbrunner, Clemens; Hernandez‐Sosa, Gerardo; Baumgartner, Eugen; Hesser, G.; Roither, J.; Heiß, Wolfgang; Sitter, H.

doi:10.1063/1.3086295

Cited by 19 publications

(18 citation statements)

References 20 publications

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“…The emission spectrum is composed of several peaks with the maximum of the highest peak located at 425 nm. The spectra match the typical EL spectrum previously reported for PSP [27, 37], therefore, in our OLEDs, the PSP emission is not affected by the presence of the PPNB:PVK layer. Furthermore, the I–V characteristics of this OLED is presented in Fig.…”

Section: Resultssupporting

confidence: 89%

Photo-Fries-based photosensitive polymeric interlayers for patterned organic devices

et al. 2012

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This work reports on the investigation of the photosensitive polymer poly(diphenyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate) (PPNB), which undergoes the photo-Fries rearrangement upon illumination with UV-light, used as interfacial layers in organic electronic devices. Two cases were investigated: the use of a blend of PPNB with poly-vinylcarbazole (PVK) as an interlayer in para-sexiphenyl (PSP) based organic light emitting diodes (OLEDs) and the use of PPNB as gate dielectric layer in organic field effect transistors (OFETs). The photo-Fries rearrangement reaction causes a change of the polymer chemical structure resulting in a change of its physical and chemical properties. The electroluminescence spectra and emission of the PSP OLEDs are not affected when fabricated with a non-UV-illuminated PPNB:PVK blend. However, the electroluminescence is totally quenched in those OLEDs fabricated with UV-illuminated PPNB:PVK blend. Although the dielectric constant of PPNB increases upon UV-treatment, it is demonstrated that those OFETs built with UV-treated PPNB as gate dielectric have lower performance than those OFETs built with non-UV-treated PPNB. Furthermore, the effect of the UV-illumination of PPNB and PPNB:PVK blend on the growth of the small molecules C60 and PSP has been studied by atomic force microscopy. Using photolithography, this kind of photochemistry can be performed to spatially control and tune the optical and electrical performance of organic electronic devices.

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Section: Resultssupporting

confidence: 89%

Photo-Fries-based photosensitive polymeric interlayers for patterned organic devices

et al. 2012

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“…Electro-optical characterization showed homogeneous deep-blue emission, exhibiting CIE color coordinates of x ¼ 0:18 and y ¼ 0:11, which is close to the National Television System Committee (NTSC) blue color standard (x ¼ 0:14 and y ¼ 0:08) [15]. In addition, color stability, low losses and a low leakage current of the device could be demonstrated.…”

Section: Discussionmentioning

confidence: 75%

“…The ITO surface is very smooth, exhibiting a rms roughness of 1.18 nm. PEDOT layers have been deposited on top to improve band alignment and injection as reported for a similar small molecule-based OLED (para-hexaphenyl) [15]. The PEDOT surface exhibits a rms roughness of 7.7 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Another problem related to the issue of a high band gap is the consequence that the lowest unoccupied molecular orbital (LUMO) is close to the vacuum energy level, which reduces the lifetimes of blue OLEDs because the material is susceptible to oxidation. Nevertheless, there are many reports on blue-emitting OLEDs [4,[11][12][13][14][15][16][17][18][19][20] and the optimization of device structure as well as the investigation of new blue emitters is still in progress.…”

Section: Introductionmentioning

confidence: 99%

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Non-doped, blue-emitting, color-stable, organic light-emitting diode based on 2,2′:6′,2″-ternaphthalene

et al. 2014

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A novel non-doped blue-emitting material, 2,2 0 :6 0 ,2 00 -ternaphthalene (NNN), which is based on three naphthalene units forming a rodlike molecule, has been synthesized and characterized. Organic light-emitting diodes based on NNN as emitter exhibit blue emission with Commission Internationale de l'Eclairage color coordinates of x = 0.18 and y = 0.11. In addition, the morphology and crystallographic structure of the NNN thin films has been investigated. NNN deposited on poly[3,4-(ethylenedioxy) thiophene]:poly (styrene sulfonate) on Indium Tin Oxide-covered glass forms crystalline structures of high crystallographic quality. The molecules are aligned almost perpendicular to the substrate surface and exhibit a tilt angle of 23 .

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“…[10][11][12] Moreover, PSP is a very promising candidate as an electroactive layer in OLED displays due to its blue luminescence ͑E g = 3.1 eV͒ and high quantum yield ͑30%͒. [13][14][15][16] Interestingly, waveguiding and coherent random laser action, providing threshold fluences as low as 0.5 J / cm 2 , have also been observed in single and an arrangement of nanofibers. [17][18][19][20] As a consequence of the crystalline arrangement of PSP within the fibers, the absorbance and photoluminescence ͑PL͒ of the films strongly depend on the polarization of the incidence light relative to the transition dipole of the molecules.…”

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confidence: 95%

Growth and optical properties of α-sexithiopene doped para-sexiphenyl nanofibers

Hernandez‐Sosa

Simbrunner

Sitter

2009

Applied Physics Letters

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The deposition of highly crystalline self-assembled para-sexiphenyl (PSP) nanofibers doped with α-sexithiophene (6T) is reported. It is demonstrated that the morphology and orientation of the nanofibers are not altered by the presence of 6T, while the photoluminescence (PL) emission can be modified by the doping concentration, suggesting effective incorporation of the dopant into the nanofibers. Moreover, strong dependence of the PL intensity with the excitation polarization underlines the high molecular order within the crystalline matrix. Due to the expected dipole-dipole interaction provided by the highly ordered structures the observed results can be explained by a Förster energy transfer.

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Para-sexiphenyl-CdSe/ZnS nanocrystal hybrid light emitting diodes

Cited by 19 publications

References 20 publications

Photo-Fries-based photosensitive polymeric interlayers for patterned organic devices

Photo-Fries-based photosensitive polymeric interlayers for patterned organic devices

Non-doped, blue-emitting, color-stable, organic light-emitting diode based on 2,2′:6′,2″-ternaphthalene

Growth and optical properties of α-sexithiopene doped para-sexiphenyl nanofibers

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