Characterization of white electroluminescent devices fabricated using conjugated polymer blends

Hwang, Do‐Hoon; Park, Moo‐Jin; Kim, Suk-Kyung; Lee, Nam-Heon; Lee, Changhee; Kim, Yong-Bae; Shim, Hong‐Ku

doi:10.1557/jmr.2004.0261

Cited by 20 publications

(6 citation statements)

References 25 publications

(23 reference statements)

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“…Conjugated polymers have received a great deal of interest for a variety of applications, especially in displays; however, the production of white light has been problematic because the width of an emission peak from a single polymer species is generally not broad enough to cover the entire spectrum of visible light. White polymer light-emitting diodes (PLEDs) were prepared by introducing small amounts of red and green-emissive moieties grafted onto, , or doped into, − a blue-emitting polymer. Energy transfer from the wide-gap host polymer to the smaller-gap species, followed by concurrent emission from the three chromophores, yields white light.…”

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confidence: 99%

Inhibition of Energy Transfer between Conjugated Polymer Chains in Host/Guest Nanocomposites Generates White Photo- and Electroluminescence

2006

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The generation of white light requires the combination of two or more chromophores that emit simultaneously. The observed color of a mixture of light-emitting molecules, however, originates generally only from the lowest band-gap species because of efficient energy transfer between the chromophores which is difficult to avoid. Here we report on a nanocomposite material designed to yield pure and stable white photo- and electroluminescence. In this material, red, green, and blue emitting conjugated polymers are confined within the galleries of a layered semiconducting host matrix. The host hinders polymer pi-pi interactions which are responsible for the energy transfer between polymer chains, consequently, emission from the three chromophores is observed simultaneously resulting in white photoluminescence. The efficacy of the nanocomposites is demonstrated in simple single-layer white-emitting polymer diodes. The mechanism suggested here for white light generation, supported by extensive luminescence measurements, is in contrast to that previously reported in white-emitting polymer diodes where efficient energy transfer between polymer chains was essential for obtaining white light.

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confidence: 99%

Inhibition of Energy Transfer between Conjugated Polymer Chains in Host/Guest Nanocomposites Generates White Photo- and Electroluminescence

2006

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“…Poly(91FV-co-9PV) [10] and MEH-PPV [9] were synthesized according to procedures outlined in the literatures. The properties of the polymers used in the blends are summarized in Table 1.…”

Section: Synthesis Of Poly(91fv-co-9pv) and Meh-ppvmentioning

confidence: 99%

“…In both vacuum-deposited small molecule devices and solution-processed polymer devices, control of the energy transfer between the red, green, and blue dyes is essential, and usually requires the introduction of very low levels of doping controls. Recently, we found that there is inefficient energy transfer between poly(fluorene) (PF) and poly (1,4- [7][8][9]. Therefore, it is possible to obtain white light emission from a blend of PF and PPV derivatives by controlling the blend ratio.…”

Section: Introductionmentioning

confidence: 99%

Poly(arylenevinylene) blends for white light emitting diodes

Kang

Park

Kim

et al. 2006

Current Applied Physics

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“…There are two major ways to get a white light emission from WPLEDs. The first is to blend red and blue polymer dyes together to form a single film . However, these devices usually face the difficulties of low efficiency and/or color instability due to intrinsic phase separation.…”

Section: Introductionmentioning

confidence: 99%

White Light-Emitting Devices Based on Star-Shape Polymers with a Bisindolylmaleimide Core

Lin

et al. 2010

Macromolecules

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A new type of star-shape polymers employing bisindolylmaleimide dye (2a-c) as the core and poly(2,7-fluorene) (PF) and/or poly(2,7-carbazole) (PC) as the arms were synthesized. These materials exhibited dual emissions consisting of an intensive blue luminescence from PF or PC and an orange emission from maleimide a result of partial energy transfer between the two. Highly efficient white light emitting devices were fabricated using a single emitting film made by spin-coating method. The electroluminescence (EL) properties of the devices were investigated from several directions, such as the loading amount of maleimide core, the concentration dependent spectral changes, the difference in the composition of arms, and the substituent effect in the indole segment, etc. A typical device based on the star-shape polymer MF001 containing 0.01 mol % of core exhibited a maximal luminous efficiency of 7.2 cd/A and external quantum efficiency of 3.2%. The device based on MMF001 with a methyl substituent on the indole group can be improved to reaching a maximal brightness of 11450 cd/m 2 , and that based on MFC1001 with arms comprising equal amount of PF and PC can be boosted to a maximal power efficiency of 4.8 lm/w. All devices can be fabricated readily and turned on at a considerable low voltage (<5 V).

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Characterization of white electroluminescent devices fabricated using conjugated polymer blends

Cited by 20 publications

References 25 publications

Inhibition of Energy Transfer between Conjugated Polymer Chains in Host/Guest Nanocomposites Generates White Photo- and Electroluminescence

Inhibition of Energy Transfer between Conjugated Polymer Chains in Host/Guest Nanocomposites Generates White Photo- and Electroluminescence

Poly(arylenevinylene) blends for white light emitting diodes

White Light-Emitting Devices Based on Star-Shape Polymers with a Bisindolylmaleimide Core

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