17.2: White OLED Structures using Molecularly Doped Charge Transport Layers

Werner, Ansgar; Burghart, Markus; Murano, Sven; Schneider, O.; Stübinger, Thomas; Limmert, Michael E.; Blochwitz‐Nimoth, Jan

doi:10.1889/1.2433165

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…As described elsewhere, there are different approaches to achieve such a white, e.g., stacked OLEDs, hybrid OLEDs with both phosphorescent and fluorescent emitters, or fully fluorescent OLEDs. 20 The latter one was used to demonstrate the capability of the newly developed n-dopant NDN-26. In a one-to-one comparison on the same substrate, NDN-1 and NDN-26 perform identically in terms of voltage, efficiency, lifetime, color, and temperature stability.…”

Section: White-emitting Devices (Bottom Emitting)mentioning

confidence: 99%

PIN OLEDs — Improved structures and materials to enhance device lifetime

Birnstock¹,

Canzler²,

Hofmann³

et al. 2008

J Soc Info Display

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Currently, three issues are identified that decide upon the commercial success of organic light-emitting diodes (OLEDs), both in display and lighting applications: power efficiency, lifetime, and price competitiveness. PIN OLEDs are widely seen as the preferred way to maximize power efficiency. Here, it is reported that this concept also delivers the world longest lifetimes. For a highly efficient deep-red PIN OLED, a half-lifetime of 25,000 hours for a starting brightness of 10,000 cd/m 2 and a minimal voltage increase over lifetime is reported. This value corresponds to more than 1 × 10 6 hours at 1000 cd/m 2 using an exponent of n = 1.7, which was measured by driving the OLEDs at different starting luminances. Because there is no initial luminance drop, these PIN OLEDs also exhibit a very high 80% lifetime (>300,000 hours at 1000 cd/m 2 ). New record lifetime values for blue and green will be reported as well. Additionally, further topics that have impact on the production yield and cost such as the newly developed air-stable organic n-doping material NDN-26 and top-emitting structures will be discussed.

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Section: White-emitting Devices (Bottom Emitting)mentioning

confidence: 99%

PIN OLEDs — Improved structures and materials to enhance device lifetime

Birnstock¹,

Canzler²,

Hofmann³

et al. 2008

J Soc Info Display

Self Cite

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“…In the last few years, organic light‐emitting diodes (OLEDs) for general lighting applications have shown their potential for long lifetimes as well as high efficiencies 1, 2. Today, their optimization is not only driven by improvement of materials but also by optimization of layer stack concepts 3, 4.…”

Section: Introductionmentioning

confidence: 99%

Triplet exciton transfer mechanism between phosphorescent organic dye molecules

Steinbacher¹,

Krause²,

Hunze³

et al. 2011

Physica Status Solidi (a)

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We fabricate simple, solution processed layers containing two kinds of phosphorescent, organic dyes in a poly(methyl methacrylate) (PMMA) matrix. After optical excitation, the close proximity of the emitter molecules with different triplet energies T 1 causes a transfer of excitons from the more highly excited dye to the lower one. Optical characterization by photoluminescence (PL) and time resolved PL (TRPL) measurements leads to qualitative and quantitative investigations of the underlying exciton transfer principle. It can be shown that Dexter transfer is not able to describe the experimentally obtained data while an established model for exciton migration between fluorescent molecules, based on Förster theory, presents a consistent picture. Using this model, experimentally obtained values for the characteristic interaction distance R 0 agree well with theoretical predictions by basic Förster theory.

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“…Various techniques have been reported for producing white light by color mixing. Among them, one of the most promising techniques is the use of stacked white OLEDs, [1][2][3][4] which connect individual red, green, and blue emission units or multiple white emission units in series. Because each emission unit is an independent OLED, it is expected that various hues can be obtained and a stable color can be achieved over a wide current range without drawbacks to the possible shift of the recombination zone at different driving current.…”

Section: Introductionmentioning

confidence: 99%

White stacked OLED with 38 lm/W and 100,000‐hour lifetime at 1000 cd/m² for display and lighting applications

He¹,

Rothe²,

Murano³

et al. 2009

J Soc Info Display

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Abstract— The three critical parameters in determining the commercial success of organic light‐emitting diodes (OLEDs), both in display and lighting applications, are power efficiency, lifetime, and price competitiveness. PIN technology is widely considered as the preferred way to maximize power efficiency and lifetime. Here, a high‐efficiency and long‐lifetime white‐light‐emitting diode, which has been realized by stacking a blue‐fluorescent emission unit together with green‐ and red‐phosphorescent emission units, is reported. Proprietary materials have been used in transport layers of each emission unit, which significantly improves the power efficiency and stability. The power efficiency at 1000 cd/m2 is 38 lm/W with CIE color coordinates of (0.43, 0.44) and a color‐rendering index (CRI) of 90. An extrapolated lifetime at an initial luminance of 1000 cd/m2 is above 100,000 hours, which fulfils the specifications for most applications. The emission color can also be easily tuned towards the equal‐energy white for display applications by selecting emitting materials and varying the transport‐layer cavities.

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17.2: White OLED Structures using Molecularly Doped Charge Transport Layers

Cited by 11 publications

References 1 publication

PIN OLEDs — Improved structures and materials to enhance device lifetime

PIN OLEDs — Improved structures and materials to enhance device lifetime

Triplet exciton transfer mechanism between phosphorescent organic dye molecules

White stacked OLED with 38 lm/W and 100,000‐hour lifetime at 1000 cd/m² for display and lighting applications

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17.2: White OLED Structures using Molecularly Doped Charge Transport Layers

Cited by 11 publications

References 1 publication

PIN OLEDs — Improved structures and materials to enhance device lifetime

PIN OLEDs — Improved structures and materials to enhance device lifetime

Triplet exciton transfer mechanism between phosphorescent organic dye molecules

White stacked OLED with 38 lm/W and 100,000‐hour lifetime at 1000 cd/m2 for display and lighting applications

Contact Info

Product

Resources

About

White stacked OLED with 38 lm/W and 100,000‐hour lifetime at 1000 cd/m² for display and lighting applications