A novel hybrid organic/inorganic photonic crystal slab showing a resonance action at the band edge

Petti, Lucia; Rippa, Massimo; Zhou, Jun; Manna, Liberato; Mormile, Pasquale

doi:10.1088/0957-4484/22/28/285307

Cited by 11 publications

(8 citation statements)

References 38 publications

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“…The PC area was seen as blue (triangular) or green (square) because of the wavelength-selective diffraction by the hybrid PC. 8,12,17,38,39 The vertical extraction of the light, by the coupling of the modes guided by the PC slab to the free radiation via Bragg scattering, is ruled by a phasematching condition, namely by the conservation of the in-plane component of the momentum at the air-dielectric interface.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Novel Two-Dimensional Nanopatterned Conductive PEDOT:PSS Films for Organic Optoelectronic Applications

Petti

Rippa

Capasso

et al. 2013

ACS Appl. Mater. Interfaces

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This paper presents a novel strategy to fabricate two-dimensional poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) photonic crystals (PCs) combining electron beam lithography (EBL) and plasma etching (PE) processes. The surface morphology of PEDOT:PSS PCs after mild oxygen plasma treatment was investigated by scanning electron microscopy. The effects on light extraction are studied experimentally. Vertical extraction of light was found to be strongly dependent on the geometric parameters of the PCs. By changing the lattice type from triangular to square and the geometrical parameters of the photonic structures, the resonance peak could be tuned from a narrow blue emission at 445 nm up to a green emission at 525 nm with a full width at half-maximum of 20 nm, which is in good agreement with Bragg's diffraction theory and free photon band structure. Both finite-difference time-domain and plane wave expansion methods are used to calculate the resonant frequencies and the photonic band structures in the two-dimensional photonic crystals showing a very good agreement with the experiment results. A 2D nanopatterned transparent anode was also fabricated onto a flexible polyethylene terephthalate (PET) substrate and it was integrated into an organic light-emitting diode (OLED). The obtained results fully confirm the feasibility of the developed process of micro/nano patterning PEDOT:PSS. Engineered polymer electrodes prepared by this unique method are useful in a wide variety of high-performance flexible organic optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Fabrication of Novel Two-Dimensional Nanopatterned Conductive PEDOT:PSS Films for Organic Optoelectronic Applications

Petti

Rippa

Capasso

et al. 2013

ACS Appl. Mater. Interfaces

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“…These materials exhibit significant promise for a variety of applications including sensors [3,4], displays [5,6], photovoltaics [7,8], photonic devices [9,10] and non-volatile memory devices [11,12]. The memory devices consist of single or triple active nanocomposite layers sandwiched between two terminals; single layer architecture is, however, considered to be suitable for high density data storage.…”

Section: Introductionmentioning

confidence: 99%

Hybrid phthalocyanine/lead sulphide nanocomposite for bistable memory switches

Khozaee

Sosa‐Vargas

Cammidge

et al. 2015

Mater. Res. Express

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A simple, one-step method is employed to produce, at room temperature, a single layer of an organic-inorganic nanocomposite containing non-aggregated lead sulphide (PbS) quantum dots (QDs) embedded in a 130nm thick solution processed film of the organic semiconductor 6PcH2 (metal-free, non-peripherally substituted octahexyl phthalocyanine) on indium tin oxide (ITO). The mean size of PbS QDs is found from X-ray diffraction and transmission electron microscopy techniques to be much smaller than the Bohr radius. Further evidence of the quantum confinement effect is provided by a blue shift in the absorption spectrum and the increased band gap of 1.95eV with respect to bulk PbS. The current-voltage characteristics of the hybrid and pristine 6PcH2 films, both in a sandwich configuration with the aluminium top electrode, exhibit bistable switching type hysteresis. The on-off ratio of the nanocomposite device is at least three orders of magnitude higher than that for 6PcH2 organic films, while both devices operate at a very low bias voltage of 0.5V. The inclusion of the PbS QDs into the 6PcH2 film enhances the conductivity by nearly two orders of magnitude over that of comparable pristine 6PcH2 film due to the formation of a charge transfer complex with PbS QDs and 6PcH2 acting as acceptors and donors of electrons, respectively.

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“…[21][22][23][24] The fabrication of active nanocomposites based on CdSe/ CdS core-shell NRs and polymers has already been demonstrated. 20,[25][26][27] However, to the best of our knowledge, an investigation of the tuning properties of different designed ThMo structures to match the properties of the active photonic material to obtain enhanced performance of a device has not been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Bragg extraction of light in 2D photonic Thue–Morse quasicrystals patterned in active CdSe/CdS nanorod–polymer nanocomposites

Rippa¹,

Capasso²,

Mormile³

et al. 2013

Nanoscale

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In this paper two-dimensional (2D) photonic Thue-Morse quasicrystals (ThMo-PQCs) in active CdSe/CdS nanorod (NR) doped polymer nanocomposites are proposed and experimentally demonstrated. Active PQCs and undoped lattices have been prepared in a one-step fabrication process by an electron beam lithography technique (EBL) and the effects on light extraction and emission directionality are studied experimentally. Vertical extraction of light was found to be strongly dependent on both the geometric parameters of the ThMo-PQCs and the presence of NR dopants. By changing the geometrical parameters of the photonic structures, the resonance peak could be tuned from a narrow bluish green emission at 543 nm up to a red-NIR emission at 711 nm with a full width at half-maximum of 22 nm which is in good agreement with Bragg's diffraction theory and free photon band structure. Angular resolved measurements revealed a directional profile in the far-field distribution with guided mode extraction in both doped and undoped PQCs and an enhancement as high as 6.5-fold in light extraction was achieved in the doped photonic structures. These experimental results indicate the critical role of the CdSe/CdS NRs in improving the light extraction efficiency of 2D ThMo-PQCs for solid-state lighting and lasing.

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A novel hybrid organic/inorganic photonic crystal slab showing a resonance action at the band edge

Cited by 11 publications

References 38 publications

Fabrication of Novel Two-Dimensional Nanopatterned Conductive PEDOT:PSS Films for Organic Optoelectronic Applications

Fabrication of Novel Two-Dimensional Nanopatterned Conductive PEDOT:PSS Films for Organic Optoelectronic Applications

Hybrid phthalocyanine/lead sulphide nanocomposite for bistable memory switches

Bragg extraction of light in 2D photonic Thue–Morse quasicrystals patterned in active CdSe/CdS nanorod–polymer nanocomposites

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