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28 Jan 2008

Volume 92, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 92, 041901 (2008); http://dx.doi.org/10.1063/1.2831926 (3 pages)

M. A. Avila, K. Suekuni, K. Umeo, H. Fukuoka, S. Yamanaka, and T. Takabatake
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High-efficiency stacked white organic light-emitting diodes

Tae-Woo Lee, Taeyong Noh, Byoung-Ki Choi, Myeong-Suk Kim, Dong Woo Shin, and Junji Kido

Appl. Phys. Lett. 92, 043301 (2008); http://dx.doi.org/10.1063/1.2837419 (3 pages) | Cited 9 times

Online Publication Date: 29 January 2008

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We report efficient tandem white organic light-emitting diodes (WOLEDs) by using bathocuproine:Cs2CO3/MoO3 as an effective interconnecting layer. We utilized two primary colors of sky blue and orange fluorescent emitters to obtain efficient white electroluminescence. Although single WOLEDs using two adjacent emitting layers showed a maximum current efficiency of 7.96 cd/A with Commission Internationale d’Eclairage (CIE) coordinates of (0.28, 0.34), the tandem WOLED device made by stacking two single color OLEDs in series demonstrated doubled maximum current efficiency of 17.14 cd/A with CIE coordinates of (0.28, 0.41). The stacking of different single color OLEDs in series instead of double stacking of WOLEDs can be useful to achieve highly efficient WOLEDs because it can reduce the number of layers of the devices.
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85.60.Jb Light-emitting devices
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Nanophotoswitches with a high on/off ratio based on a structure of indium tin oxide/organic insulator/metal

Xinjun Xu, Lidong Li, Gui Yu, Chong-An Di, Dacheng Wei, Shanghui Ye, and Yunqi Liu

Appl. Phys. Lett. 92, 043302 (2008); http://dx.doi.org/10.1063/1.2839291 (3 pages) | Cited 1 time

Online Publication Date: 30 January 2008

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Highly photosensitive nanoswitches with a structure of indium tin oxide/organic insulator/metal have been fabricated. Electric current in the photoswitches is sensitive to ultraviolet (UV) radiation, and can be inhibited and recovered by exposing the photoswitch to, or shielding it from, UV radiation, respectively. Photoswitches with a very high on/off ratio exceeding 106, which is the highest ratio recorded for all reported organic photoswitches, have been demonstrated under UV radiation even with a low power density ( ∼ 10−5 W/cm2).
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42.79.Ta Optical computers, logic elements, interconnects, switches; neural networks
85.35.-p Nanoelectronic devices
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Efficient, visible organic light-emitting diodes utilizing a single polymer layer doped with quantum dots

I. H. Campbell and B. K. Crone

Appl. Phys. Lett. 92, 043303 (2008); http://dx.doi.org/10.1063/1.2839407 (3 pages) | Cited 10 times

Online Publication Date: 30 January 2008

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We demonstrate organic light-emitting diodes (OLEDs) using a single active layer consisting of CdSe/ZnS quantum dots (QDs) dispersed in poly (9,9-dioctylfluorene) (PFO). The diodes have an external quantum efficiency of ∼ 0.5% and reach 0.1 A/cm2 at 6.5 V. These results are comparable to complex, multilayer QD OLEDs. Built-in potential measurements show that the QD valence levels are shifted to lower binding energy when compared to quantum confinement based estimates, and are close to PFO valence levels. Devices using red and green QDs emit predominantly from the QDs but the spectrum of blue QDs is perturbed by interactions with PFO.
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85.60.Jb Light-emitting devices
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