An Organic Down‐Converting Material for White‐Light Emission from Hybrid LEDs

Findlay, Neil J.; Bruckbauer, Jochen; Inigo, Anto R.; Breig, Benjamin; Arumugam, Sasikumar; Wallis, D. J.; Martin, Robert; Skabara, Peter J.

doi:10.1002/adma.201402661

Cited by 119 publications

(111 citation statements)

References 36 publications

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“…4 A very active branch of scientific development is putting great effort in fine-tuning the BODIPY properties by introducing suitable chemical groups onto the central core. As a result, the BODIPY family is expanding constantly and has found applications in wide-ranging fields, from technological (organic light-emitting diodes, [5][6][7] dye-sensitized solar cells [8][9] ) to analytical and in vivo imaging applications. [10][11] Recent advances in organic synthesis have expanded the possibilities of controlled modification of the BODIPY moiety, including substitution by tailored groups at every position of the core.…”

Section: Introductionmentioning

confidence: 99%

Effect of the substitution position (2, 3 or 8) on the spectroscopic and photophysical properties of BODIPY dyes with a phenyl, styryl or phenylethynyl group

et al. 2016

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Noël (2016) Effect of the substitution position (2, 3 or 8) on the spectroscopic and photophysical properties of BODIPY dyes with a phenyl, styryl or phenylethynyl group. RSC Advances, 6 . pp. 102899-102913. ISSN 2046-2069 Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/37842/1/Ph%20Ethyn%20Styryl%20BODIPYs%20-%20Accepted%20Manuscript.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham. ABSTRACT. A very active branch of organic chemistry is putting great effort in tailoring fluorescent dyes for a myriad of applications, from technological to bioanalytical and biomedical applications. Among the major families of fluorophores, those derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY dyes) are undergoing a recent boost thanks to the simplicity and robustness of the chemistry involved. The BODIPY core can be modified with numerous side groups, the 8-position being a modification place with important effects on the spectroscopic and photophysical properties of the resulting dyes. Likewise, previous work has shown that the addition of groups attached at the 3-and 2-positions can result in dyes with very different properties. Herein, we generalize the effect of the substituent side groups by studying nine BODIPY dyes substituted with a phenyl, styryl or phenylethynyl moiety at the 2-, 3-or 8-position of the BODIPY scaffold. Within the class of phenyl-or phenylethynyl-substituted dyes, substitution at the 2-position always leads to dyes with the broadest bandwidths and the largest Stokes shifts. We investigate the solvent effect on the spectroscopic properties of the dyes, using four empirical solvent scales (dipolarity, polarizability, acidity and basicity: Catalán, J. Phys. Chem., 2009, 113, 5951). These analyses identify solvent dipolarity and polarizability as critical parameters accounting for the observed solvent-dependent shifts of the absorption and emission maxima. Finally, time-dependent density functional theory calculations provide insights into the structural and energetic issues concerning the spectroscopic properties of these fluorophores.KEYWORDS: Fluorescent dyes, solvent effect, Catalán solvent scales, quantum chemical calculations TOCUnderstanding the spectroscopic properties of BODIPY dyes for a rationale design of tailored fluorescent ...

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Section: Introductionmentioning

confidence: 99%

Effect of the substitution position (2, 3 or 8) on the spectroscopic and photophysical properties of BODIPY dyes with a phenyl, styryl or phenylethynyl group

et al. 2016

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“…15) in 1,4-cyclohexanedimethanol divinyl ether (CHDV) containing a photoacid generator [37]. Under UV light exposure, CHDV is cured in a non emissive matrix which encapsulates the organic dye and generates a smooth solid dome on top of the LED chip.…”

Section: Approach (5): White Light Emission From Inorganic Leds and Omentioning

confidence: 99%

Organic emitters for solid state lighting

Farinola

Ragni

2015

J Sol State Light

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White organic light emitting diodes (WOLEDs) have gained considerable attention of academic and industrial research communities as promising alternative to incandescent lamps, fluorescent tubes and inorganic LEDs for low energy consumption lighting applications. WOLEDs are expected to become one of the next generation lighting sources because of their high color tunability and color quality, which can be easily achieved by proper chemical design of organic electroluminescent materials. Contrary to their inorganic counterparts, WOLEDs also bear the distinctive feature of being available as flexible and large area devices. Over the last decades, a lot of efforts have been spent on defining suitable strategies to highly efficient WOLEDs based on the use of properly tailored organic emitters. Here we survey the main chemical approaches to white electroluminescence from organic light emitting materials, highlighting strong and weak points of each strategy. Current research on new hybrid white light emitting devices based on the combination of inorganic LEDs and organic down color converters is also reviewed by some representative examples.

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“…They offer relatively easy bandgap tuning through the visible which could allow a selective response to wavelengths relevant for VLC. Such receivers could therefore have great implications for the connectivity of future smart devices, from sensor networks to smart clothing, many of which could become selfpowered units as part of the 'Internet of Things'.Organic semiconductor materials have recently attracted much attention in the field of VLC [9][10][11]. They offer tremendous scope for simple processing and integration on different substrates, and have been used as colour converters to generate white light with a blue LED backlight.…”

mentioning

confidence: 99%

“…Organic semiconductor materials have recently attracted much attention in the field of VLC [9][10][11]. They offer tremendous scope for simple processing and integration on different substrates, and have been used as colour converters to generate white light with a blue LED backlight.…”

mentioning

confidence: 99%

Organic solar cells as high-speed data detectors for visible light communication

Zhang¹,

Tsonev²,

Videv³

et al. 2015

Optica

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We show that solar cells, widely used in portable devices for power generation, can simultaneously extract a highspeed data signal in an optical wireless communication link. This paper reports the first use of an organic solar cell as an energy-harvesting receiver for visible light communications (VLC). While generating maximum power in the cell, the communication link can deliver a data-rate of 34.2 Mbps with a bit error rate of 4.08 × 10 -4 using an implementation of orthogonal frequency division multiplexing. This approach could lead to printed optical data receivers in future eco-friendly VLC systems. The looming radio frequency (RF) spectrum crunch has prompted research into alternative regions of the electromagnetic (EM) spectrum for future wireless communication systems. The infrared and visible light region of the EM spectrum are of particular interest since the vast amount of available bandwidth is unregulated and free of electromagnetic interference (EMI). The growing infrastructure of LED lighting offers a particular opportunity for visible light communications (VLC) with power-efficient dual-use sources, which provide simultaneous illumination and very high rate wireless data transmission [1][2][3][4][5]. While VLC data links normally use photodiode (PD) receivers [5] (either positive-intrinsic-negative (PIN) PDs or avalanche PDs), there is a parallel opportunity for duality by using instead a solar cell for simultaneous energy harvesting and data detection. Wang et al. recently showed that a standard commercial multi-crystalline silicon solar panel could be used for this dual purpose, to receive a data-rate of 11.84 Mbps while generating approximately 2 mW of electrical power [6,7]. This advance implies that it could be possible for any piece of electronic equipment with an integrated solar cell to engage in highspeed data communication while utilising the energy from the light signal or ambient lighting to power the receiver electronics.However, to unlock the full potential of this approach it would be very attractive to use an alternative solar cell technology that could be more easily integrated on different devices/substrates, or even be mechanically flexible. The field of organic electronics offers these possibilities, and here we report the first use of an organic semiconductor solar cell as the energy-harvesting receiver in an optical wireless data link. When the cell generates maximum power, the communication link is capable of delivering a data-rate of 34.2 Mbps with a bit error rate (BER) of 4.08 × 10 -4 using an implementation of orthogonal frequency division multiplexing (OFDM). Such organic solar cells could serve as a future platform for ubiquitous VLC receivers. They can be mass manufactured by roll-to-roll printing on a flexible foil [8], giving the possibility of very inexpensive flexible/conformal panels which could be integrated with an extremely wide range of devices. They offer relatively easy bandgap tuning through the visible which could allow a selective response to wavelengt...

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An Organic Down‐Converting Material for White‐Light Emission from Hybrid LEDs

Cited by 119 publications

References 36 publications

Effect of the substitution position (2, 3 or 8) on the spectroscopic and photophysical properties of BODIPY dyes with a phenyl, styryl or phenylethynyl group

Effect of the substitution position (2, 3 or 8) on the spectroscopic and photophysical properties of BODIPY dyes with a phenyl, styryl or phenylethynyl group

Organic emitters for solid state lighting

Organic solar cells as high-speed data detectors for visible light communication

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