White top-emitting organic light-emitting diodes employing a heterostructure of down-conversion layers

Gohri, Vipul; Hofmann, Simone; Reineke, Sebastian; Rosenow, Thomas C.; Thomschke, Michael; Levichkova, Marieta; Lüssem, Björn; Leo, Karl

doi:10.1016/j.orgel.2011.09.002

Cited by 27 publications

(17 citation statements)

References 24 publications

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“…The sky-blue organic emitter FIrpic with a peak emission wavelength at 475 nm was used as its emission is absorbed better by DCM molecules (absorption maximum at 480 nm) than the emission from fluorescent blue emitters [16]. In addition, it using phosphorescence from triplet excitons also improves device efficiency [17].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it using phosphorescence from triplet excitons also improves device efficiency [17]. DCM-doped Alq3 (2 wt%) layers with various thicknesses were deposited on the top of the Ag cathode to perform color-conversion and create white emission in the top direction [16,18,19]. Since the color-conversion layer also forms an outermost dielectric capping layer, its thickness was optimized with a custommade optical simulation tool considering dipole emission and Purcell effect [20] with results shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Transparent organic light-emitting diodes with different bi-directional emission colors using color-conversion capping layers

Lee

Koh

Cho

et al. 2015

Journal of Luminescence

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We report a study on transparent organic light-emitting diodes (OLEDs) with different bidirectional emission colors, enabled by color-conversion organic capping layers. Starting from a transparent blue OLED with an uncapped Ag top electrode exhibiting an average transmittance of 33.9%, a 4-(Dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM)-doped tris-(8-hydroxy-quinolinato)-aluminium (Alq3) capping layer is applied to achieve color-conversion from blue to orange-red on the top side while maintaining almost unchanged device transmittance. This color-conversion capping layer does not only change the color of the top side emission, but also enhances the overall device efficiency due to the optical interaction of the capping layer with the primary blue transparent OLED. Top white emission from the transparent bi-directional OLED exhibits a correlated color temperature around 6,000K-7,000K, with excellent color stability as evidenced by an extremely small

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Transparent organic light-emitting diodes with different bi-directional emission colors using color-conversion capping layers

Lee

Koh

Cho

et al. 2015

Journal of Luminescence

Self Cite

View full text Add to dashboard Cite

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“…Doping of small amounts of dye, typically, on the order of few wt%, changes the source of OLED emission from the host material to the dopant and results in higher device luminance and efficiency. Enhanced device performance has been shown with a variety of dye materials, including 4‐(dicyanomethylene)‐2‐methyl‐6‐( p ‐dimethylaminostyryl)‐4 H ‐pyran (DCM), coumarin, pyromethene, and squarylium .…”

Section: Introductionmentioning

confidence: 99%

Insights on photophysical proprieties of DCM dye in PVK host matrix

et al. 2013

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In this work, the photophysical proprieties of 4‐(dicyanomethylene)‐2‐methyl‐6‐(p‐dimethylaminostyryl)‐4H‐pyran (DCM) dye in the poly‐vinylcarbazole (PVK) matrix are analyzed with a particular attention to the energy transfer processes between the matrix and the dye. PVK films doped with weight percent varying from 1 to 8 wt% of DCM have been fabricated. The emission spectra are dominated by the presence of DCM and a strong red shift in the emission spectra of the blend has been observed as function of dye concentration. A quenching effect in the excitons lifetime increasing the concentration of the dopants has been observed. These two phenomena have been studied in terms of energy processes inside the blends. POLYM. COMPOS., 34:1500–1505, 2013. © 2013 Society of Plastics Engineers

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“…MicroOLED is pushing the boundaries of what can be achieved both in performance and pixel pitch of OLED microdisplays [19]. Fraunhofer IPMS achieved the European project HYPOLED on digital video graphics array (VGA) full-color OLED microdisplay [20] and presented an interesting bidirectional OLED microdisplay, which is able to display and sample images on one silicon chip [21].…”

Section: Introductionmentioning

confidence: 99%

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

et al. 2012

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The digital pixel driving scheme makes the organic light-emitting diode (OLED) microdisplays more immune to the pixel luminance variations and simplifies the circuit architecture and design flow compared to the analog pixel driving scheme. Additionally, it is easily applied in full digital systems. However, the data bottleneck becomes a notable problem as the number of pixels and gray levels grow dramatically. This paper will discuss the digital driving ability to achieve kilogray-levels for megapixel displays. The optimal scan strategy is proposed for creating ultra high gray levels and increasing light efficiency and contrast ratio. Two correction schemes are discussed to improve the gray level linearity. A 1280×1024×3 OLED-on-silicon microdisplay, with 4096 gray levels, is designed based on the optimal scan strategy. The circuit driver is integrated in the silicon backplane chip in the 0.35 μm 3.3 V-6 V dual voltage one polysilicon layer, four metal layers (1P4M) complementary metal-oxide semiconductor (CMOS) process with custom top metal. The design aspects of the optimal scan controller are also discussed. The test results show the gray level linearity of the correction schemes for the optimal scan strategy is acceptable by the human eye.

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White top-emitting organic light-emitting diodes employing a heterostructure of down-conversion layers

Cited by 27 publications

References 24 publications

Transparent organic light-emitting diodes with different bi-directional emission colors using color-conversion capping layers

Transparent organic light-emitting diodes with different bi-directional emission colors using color-conversion capping layers

Insights on photophysical proprieties of DCM dye in PVK host matrix

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

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