Electroluminescence from blend films of poly(3-hexylthiophene) and poly(N-vinylcarbazole)

Nishino, Hanako; Yu, Gui; Heeger, A.J.; Chen, T.-A.; Rieke, Reuben D.

doi:10.1016/0379-6779(94)02295-a

Cited by 99 publications

(42 citation statements)

References 11 publications

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“…1͒, a highly fluorescent organic laser dye with a fluorescence yield close to unity. Such a device has been widely studied, [2][3][4][5] owing to its ease of processing and may also be considered as a model for electroluminescence in nonconjugated polymers. Indeed, this soluble polymer is readily spin coated from stable solutions and all device measurements can be performed under roomatmosphere conditions, provided that stable metal electrodes are used.…”

Section: Introductionmentioning

confidence: 99%

Effect of coumarin on blue light-emitting diodes based on carbazol polymers

Gautier-Thianche

Sentein

Lorin

et al. 1998

Journal of Applied Physics

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Section: Introductionmentioning

confidence: 99%

Effect of coumarin on blue light-emitting diodes based on carbazol polymers

Gautier-Thianche

Sentein

Lorin

et al. 1998

Journal of Applied Physics

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“…4(a). The EL peak 580 nm along with a shoulder at 600 nm is attributed to poly(octyl-thiophene) [27][28][29]. The position of the EL peak is however blueshifted from the reported EL peak 660 nm for polyalkylthiophenes [28,29].…”

Section: Resultsmentioning

confidence: 83%

Development of metal sulfide-poly (3-octylthiophene) composite LB multilayers

Vidya

Suresh

Narang

et al. 2002

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Langmuir-Blodgett (LB) technique has been used to deposit composite multilayers of poly(3-octylthiophene) with cadmium arachidate (POT-CdA), zinc arachidate (POT-ZnA) and copper arachidate (POT-CuA). These composite multilayers were used as precursors to develop the respective semiconducting CdS, ZnS and Cu 2 S nanoclusters in the POT-arachidic acid (POT-AA) matrix. The formation of sulphide nanoclusters in the multilayer was determined by FTIR and UV-Vis spectroscopy. X-ray reflectivity measurements showed a drastic reduction in the layered structural order on sulphide formation. Single layer LED structures were fabricated using POT-CdA, CdS-POT-AA and ZnS-POT-AA composites as active layers. The Electoluminescence peaks from these structures are attributed to POT and nanoclusters of CdS and ZnS, respectively. The electroluminescent devices with nanoclusters containing emitter layers exhibited low turn-on voltage 5 V. Blue electroluminescence was observed at room temperature from FTO/ZnS-POT-AA/Al devices.

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“…[1] Polymer was doped with a highly fluorescent organic laser dye : coumarin-515 (Figure 1), with a fluorescence yield close to one. Such device which has been studied by many authors, [2][3][4][5] owing to its ease of processing, may also be considered as a model for electroluminescence in non-conjugated polymers. Indeed, this soluble polymer is readily spincoated from stable solutions and all device measurements can be performed under room-atmosphere conditions, provided that stable metal electrodes are used.…”

Section: Introductionmentioning

confidence: 99%

Concentration effects on charge transport in dye-doped polymer light-emitting diodes

Nunzi

Gautier-Thianche

Lorin

et al. 1998

Polymer Photonic Devices

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Light emitting diodes made of a single spin-coated layer of poly(9-vinylcarbazole) doped with coumarin-5 15 dye have been studied. The influence of dye concentration on emission and electrical characteristics is evidenced. Two different regimes are identified. At low concentrations, apparent hole injection barrier raises, holes are trapped and mobility decreases. External quantum efficiency increases with concentration. At concentrations larger than 10 %wt, coumarin aggregates, photoluminescence yield drops and electroluminescence yield increases up to 0. 1 %-photons per electron. We show that using coumarin dye in a single-layer diode improves electron-hole injection and recombination balance more than using an additional hole-blocking layer. INTRODUCTIONPolymeric semiconductor devices are receiving increasing attention in view of potential applications requiring lowcost processing over large areas. In this respect, unlike with evaporated molecules, the wet-processing capability of polymers offers total compatibility with other complementary tecimologies. In a strategy oriented towards the development of low-cost electroluminescent devices for display applications, we chose single-layer structures made of available polymer materials. In this respect, single-layer blue light-emitting-diodes were prepared using poly(9-vinylcarbazole) (PVK), a commercially available polymer with large glass-transition temperature Tg 200°C, high stability and well documented hole-transport properties.[1] Polymer was doped with a highly fluorescent organic laser dye : coumarin-515 (Figure 1), with a fluorescence yield close to one. Such device which has been studied by many authors, [2][3][4][5] owing to its ease of processing, may also be considered as a model for electroluminescence in non-conjugated polymers. Indeed, this soluble polymer is readily spincoated from stable solutions and all device measurements can be performed under room-atmosphere conditions, provided that stable metal electrodes are used. In this paper, we discuss the effect of fluorescent dye concentration on the electroluminescence behavior. Results are analyzed in view of time of flight and photoluminescence behaviors. Effect of charge injection balance is addressed using additional hole injecting or blocking layers. The electron injection and hole trapping behaviors of coumarin are evidenced. Figure 1: molecular structure of PVK (a), coumarin-5 15 (b) and PMMA-PBD polymer (c). 302 SPIE Vol. 3281 . 0277-786X/98/$1O.O0 N a) (H3C)2N N1 N CH CH2 b) H3C' Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/24/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Electroluminescence from blend films of poly(3-hexylthiophene) and poly(N-vinylcarbazole)

Cited by 99 publications

References 11 publications

Effect of coumarin on blue light-emitting diodes based on carbazol polymers

Effect of coumarin on blue light-emitting diodes based on carbazol polymers

Development of metal sulfide-poly (3-octylthiophene) composite LB multilayers

Concentration effects on charge transport in dye-doped polymer light-emitting diodes

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