P-147: Highly Efficient and Stable Blue OLED Systems

Helber, Margaret J.; Ricks, Michele; Cosimbescu, Lelia

doi:10.1889/1.2036583

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…10. The color gamut, simulated using a set of wide gamut color filters, 16 is similar for the 2007 and 2008 devices and exceeds 100% of the area of the NTSC triangle. The 2006 device has lower color gamut at 95% NTSC, which is due to the absence of green and red emission peaks in the spectrum.…”

Section: Fluorescent Tandem White Oleds For Displaymentioning

confidence: 99%

Fluorescent‐based tandem white OLEDs designed for display and solid‐state‐lighting applications

Spindler¹,

Hatwar²

2009

J Soc Info Display

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Abstract— Highly efficient tandem white OLEDs based on fluorescent materials were developed for display and solid‐state‐lighting (SSL) applications. In both cases, the white OLED must have high power efficiency and long lifetime, but there are a number of attributes unique to each application that also must be considered. Tandem OLED technology has been demonstrated as an effective approach to increase luminance, extend OLED lifetime, and allow for use of different emitters in the individual stacks for tuning the emission spectrum to achieve desired performance. Here, examples of bottom‐emission tandem white OLEDs based on small‐molecule fluorescent emitters designed for displays and for SSL applications are reported. A two‐stack tandem white OLED designed for display applications achieved 36.5‐cd/A luminance efficiency, 8500K color temperature, and lifetime estimated to exceed 50,000 hours at 1000 cd/m2. This performance is expected to meet the specifications for large AMOLED displays. A two‐stack tandem white OLED designed for SSL applications achieved 20‐lm/W power efficiency, 38‐cd/A luminance efficiency, 3500K color temperature, and lifetime estimated to exceed 140,000 hours at 1000 cd/m2. With the use of proven light‐extraction techniques, it is estimated that this tandem device will exceed 40 lm/W with more than 500,000‐hour lifetime, performance that should be sufficient for first‐generation lighting products.

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Section: Fluorescent Tandem White Oleds For Displaymentioning

confidence: 99%

Fluorescent‐based tandem white OLEDs designed for display and solid‐state‐lighting applications

Spindler¹,

Hatwar²

2009

J Soc Info Display

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“…The display simulated in this report is an 8.1" bottom-emitting panel with a 16 × 9 aspect ratio using an RGBW pixel pattern. The device characteristics are: 200 nit peak luminance, 2.5 V overhead for the TFT, 1.5 V overhead for voltage rise with aging, 0.40 PAR, optimized SAR with the constraint that no subpixel is greater than twice the size of any other subpixel, a polarizer with 44% transmittance on average across the spectrum, an image set taken from a collection of digital still camera images, and color filters such as those that have been reported [1] previously. An 8% drop in intensity across the entire input spectrum is taken to account for interference effects of the TFT.…”

Section: Power and Life Modelmentioning

confidence: 99%

62.4: Power and Lifetime Modeling of White OLED Formulations for WRGBW Display Applications

Giesen

Kondakov

Ludwicki

et al. 2009

Symp Digest of Tech Papers

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“…OLED performance is typically evaluated using simple test devices and is reported in terms of luminous yield, CIE x,y coordinates, drive voltage, and operational stability [1][2][3][4][5][6][7][8][9]. For fullcolor (RGB) displays, however, the systems engineer is more interested in how results from test devices can be used to predict the performance of a display.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, most commercial OLED displays utilize fluorescent materials to maximize display lifetime and simplify the manufacturing process, and there is significant interest in further improving the performance of fluorescent materials to accelerate the adoption of OLED technology into display applications. Using all fluorescent materials, blue OLEDs with luminous efficiency in the range of 6-11 cd/A [4,[7][8], green OLEDs with efficiency of 15-20 cd/A, and red OLEDs within the 8-11 cd/A range [8][9]11] have been reported recently. These emitters are thought to offer improvements over existing fluorescent materials commercialized for OLED display applications.…”

Section: Introductionmentioning

confidence: 99%

P‐169: Efficient, Long‐Lifetime OLED Host and Dopant Formulations for Full‐Color Displays

Ricks

Vargas

Klubek

et al. 2007

Symp Digest of Tech Papers

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We report developments in materials and formulations for blue, green, and red fluorescent OLEDs that provide lifetimes exceeding 15,000 h for a model display operating at 200 cd/m 2 with a polarizer. In addition, we describe improvements in electron transport and injection that result in a reduction in display power consumption of up to 55%. IntroductionOLED performance is typically evaluated using simple test devices and is reported in terms of luminous yield, CIE x,y coordinates, drive voltage, and operational stability [1][2][3][4][5][6][7][8][9]. For fullcolor (RGB) displays, however, the systems engineer is more interested in how results from test devices can be used to predict the performance of a display. Of particular interest is how a material change (altering the basic emission characteristics for a particular color) will impact display power consumption and lifetime.There has been significant research into highly efficient phosphorescent OLEDs to reduce display power consumption [10]; however, the lifetime is not yet acceptable for many display applications. In fact, most commercial OLED displays utilize fluorescent materials to maximize display lifetime and simplify the manufacturing process, and there is significant interest in further improving the performance of fluorescent materials to accelerate the adoption of OLED technology into display applications. Using all fluorescent materials, blue OLEDs with luminous efficiency in the range of 6-11 cd/A [4,7-8], green OLEDs with efficiency of 15-20 cd/A, and red OLEDs within the 8-11 cd/A range [8-9,11] have been reported recently. These emitters are thought to offer improvements over existing fluorescent materials commercialized for OLED display applications.In order to evaluate these emitting systems in a full-color display, a model was developed that takes into consideration most of the performance attributes of simple red, green, and blue test devices. By using this model, trade-offs in efficiency, lifetime, chromaticity, and drive voltage can be understood, and the material system with the best overall display performance can be selected. For example, a deep-blue emitter (CIE y = 0.15) with slightly lower efficiency than a lighter blue (CIE y = 0.20) is sometimes a better choice for a full-color display because the average current density required to attain the display white point is lower. It is also important to consider the properties of the charge-transport materials, given that they can affect the drive voltage and lead to a display with lower power consumption.The objective of the present study was to determine the peak power consumption and operational lifetime of a model full-color active-matrix OLED (AM-OLED) display using combinations of improved red, green, and blue fluorescent emitters. By doing this, a better understanding of the impact of red, green, and blue emission properties on full-color display performance can be achieved. Experimental ParametersA mathematical model that is used to determine display power and lifetime was descri...

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P-147: Highly Efficient and Stable Blue OLED Systems

Cited by 5 publications

References 3 publications

Fluorescent‐based tandem white OLEDs designed for display and solid‐state‐lighting applications

Fluorescent‐based tandem white OLEDs designed for display and solid‐state‐lighting applications

62.4: Power and Lifetime Modeling of White OLED Formulations for WRGBW Display Applications

P‐169: Efficient, Long‐Lifetime OLED Host and Dopant Formulations for Full‐Color Displays

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