ac excitation of organic light emitting devices utilizing conductive charge generation layers

Brückner, Jan; Christ, Nico; Bauder, Olga; Gärtner, Christian; Seyfried, Moritz; Glöckler, Felix; Lemmer, Uli; Gerken, Martina

doi:10.1063/1.3294326

Cited by 7 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The luminescence at a certain polarity increased and reached a maximum at approximately 3 μs after the induction of a polarity; this is the characteristic time required for one type of carrier in F8BT to drift and recombine with the other type of carrier. Differences in the emission intensities at each polarity can be attributed to the different mobilities of the holes and electrons in F8BT, as reported previously …”

supporting

confidence: 76%

“…Differences in the emission intensities at each polarity can be attributed to the different mobilities of the holes and electrons in F8BT, as reported previously. 32 Because bipolar charges are injected dominantly through metallic SWNTs with a low contact energy barrier with the top electrode and then transferred to the nanocomposite in our SWNT-FPEL devices, there is great freedom in choice of the materials that can be used to design these types of devices, including the type of fluorescent emission polymer, insulator, and even top electrode. For instance, a SWNT-FPEL with an Al top electrode also exhibited EL performance comparable to that achieved with an Au electrode (see Supporting Information, Figure S4).…”

Section: Nano Lettersmentioning

confidence: 99%

See 1 more Smart Citation

AC Field-Induced Polymer Electroluminescence with Single Wall Carbon Nanotubes

et al. 2011

View full text Add to dashboard Cite

We developed a high-performance field-induced polymer electroluminescence (FPEL) device consisting of four stacked layers: a top metal electrode/thin solution-processed nanocomposite film of single wall carbon nanotubes (SWNTs) and a fluorescent polymer/insulator/transparent bottom electrode working under an alternating current (AC) electric field. A small amount of SWNTs that were highly dispersed in the fluorescent polymer matrix by a conjugate block copolymer dispersant significantly enhanced EL, and we were able to realize an SWNT-FPEL device with a light emission of approximately 350 cd/m(2) at an applied voltage of ±25 V and an AC frequency of 300 kHz. The brightness of the SWNT-FPEL device is much greater than those of other AC-based organic or even inorganic ELs that generally require at least a few hundred volts. Light is emitted from our SWNT-FPEL device because of the sequential injection of field-induced holes and then electron carriers through ambipolar carbon nanotubes under an AC field, followed by exciton formation in the conjugated organic layer. Field-induced bipolar charge injection provides great material design freedom for our devices; the energy level does not have to be aligned between the electrode and the emission layer, and the balance of the carrier injected and transported can be altered in contrast to that in conventional organic light-emitting diodes, leading to an extremely cost-effective and unified device architecture that is applicable to all red-green-blue fluorescent polymers.

show abstract

supporting

confidence: 76%

Section: Nano Lettersmentioning

confidence: 99%

AC Field-Induced Polymer Electroluminescence with Single Wall Carbon Nanotubes

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Following Tanase et al [8], the carrier-density dependence of the mobility has been further developed [16][17][18] and these authors find out that the current-voltage characteristics of organic devices can be adequately modelled. However, in point of fact many groups modelling transport in organic layer continue to use the field-dependence of the mobility [19][20][21][22][23]. It seems therefore, very important to establish the connection between the two approaches and this is the topic of the present Letter.…”

mentioning

confidence: 98%

Trap origin of field-dependent mobility of the carrier transport in organic layers

Montero

Bisquert

2011

Solid-State Electronics

View full text Add to dashboard Cite

Solution‐Processed Highly Efficient Alternating Current‐Driven Field‐Induced Polymer Electroluminescent Devices Employing High‐k Relaxor Ferroelectric Polymer Dielectric

Chen

Xia

Sun

et al. 2013

Adv Funct Materials

View full text Add to dashboard Cite

Organic thin‐film electroluminescent (EL) devices, such as organic light‐emitting diodes (OLEDs), typically operate using constant voltage or direct current (DC) power sources. Such approaches require power converters (introducing power losses) and make devices sensitive to dimensional variations that lead to run away currents at imperfections. Devices driven by time‐dependent voltages or alternating current (AC) may offer an alternative to standard OLED technologies. However, very little is known about how this might translate into overall performance of such devices. Here, a solution‐processed route to creating highly efficient AC field‐induced polymer EL (FIPEL) devices is demonstrated. Such solution‐processed FIPEL devices show maximum luminance, current efficiency, and power efficiency of 3000 cd m−2, 15.8 cd A−1, and 3.1 lm W−1 for blue emission, 13 800 cd m−2, 76.4 cd A−1, and 17.1 lm W−1 for green emission, and 1600 cd m−2, 8.8 cd A−1, and 1.8 lm W−1 for orange‐red emission. The high luminance and efficiency, and solution process pave the way to industrial roll‐to‐roll manufacturing of solid state lighting and display.

show abstract

ac excitation of organic light emitting devices utilizing conductive charge generation layers

Cited by 7 publications

References 14 publications

AC Field-Induced Polymer Electroluminescence with Single Wall Carbon Nanotubes

AC Field-Induced Polymer Electroluminescence with Single Wall Carbon Nanotubes

Trap origin of field-dependent mobility of the carrier transport in organic layers

Solution‐Processed Highly Efficient Alternating Current‐Driven Field‐Induced Polymer Electroluminescent Devices Employing High‐k Relaxor Ferroelectric Polymer Dielectric

Contact Info

Product

Resources

About