Efficient triplet exciton confinement of white organic light-emitting diodes using a heavily doped phosphorescent blue emitter

Lee, Seok Jae; Seo, Ji Hoon; Kim, Jun Ho; Kim, Hoe Min; Lee, Kum Hee; Yoon, Seung Soo; Kim, Young Kwan

doi:10.1016/j.tsf.2010.04.049

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…WOLEDs using a trimeric phenylenvinylene derivative 2,5,2 ,5 -tetrakis(4 -biphenylenevinyl)biphenyl (TBVB) as a blue light-emitting layer and ultrathin 5,6,11,12-tetraphenylnaphthacene as a yellow light-emitting layer, shows a maximum luminance of 4025 cd/m 2 , current efficiency of 3.2 cd/A, and Commission Internationale de l'Eclairage (CIE) coordinates of (0.33, 0.34) at 4000 cd/m 2 [15]. High efficiency white phosphorescent organic device doped with greenish-blue and red-emitting dye with a power efficiency of 10 lm/W at a current density of 0.01 mA/cm 2 and CIE coordinates of (0.35, 0.36) has also been achieved [16]. Figure 1: Device structure of organic devices and energy level diagram of relevant materials used in this study.…”

Section: Introductionmentioning

confidence: 87%

Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

Wang

2013

International Journal of Photoenergy

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High efficiency white organic light emission devices were demonstrated with phosphor material dye bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′]iridium (acetylacetonate) and ultrathin layer structure. The ultra thin layer be composed of 4,4′-bis[N-1-naphthyl-N-phenyl-amino]biphenyl (NPB) or 4,4′-N,N′-dicarbazole-biphenyl : NPB mixed layer with blue light emission. The emission spectra of devices could be adjusted by different phosphor doping concentrations and ultra thin layer structure. Warm white light emitting device could be obtained with 5 wt% doping concentration and power efficiency of 9.93 lm/W at 5 V. Pure white light with Commission Internationale de l'Eclairage (CIE) coordinates of (0.33, 0.30) and external quantum efficiency of 4.49% could be achieved with ultra thin layer device structure and 3 wt% phosphor doped device.

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Section: Introductionmentioning

confidence: 87%

Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

Wang

2013

International Journal of Photoenergy

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“…Highly efficient organic light-emitting diodes (OLEDs) enabled by phosphorescent emitters which can utilize both singlet and triplet excitons into photons could achieve 100% internal quantum efficiency. Most research for high-performance phosphorescent organic light-emitting diodes (PHOLEDs) has been focused on using small molecules as a host, performing co-evaporation to obtain a phosphorescent emissive layer [ 6 , 7 , 8 , 9 , 10 ]. Especially blue emitting PHOLEDs are more challenging than green or red PHOLEDs because the high triplet energy values of the excitons tend to be flown out from the emissive layer without any recombination process.…”

Section: Introductionmentioning

confidence: 99%

Solution-Processed Efficient Blue Phosphorescent Organic Light-Emitting Diodes (PHOLEDs) Enabled by Hole-Transport Material Incorporated Single Emission Layer

Earmme

2021

Materials

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Solution-processed blue phosphorescent organic light-emitting diodes (PHOLEDs) based on a single emission layer with small-molecule hole-transport materials (HTMs) are demonstrated. Various HTMs have been readily incorporated by solution-processing to enhance hole-transport properties of the polymer-based emission layer. Poly(N-vinylcarbazole) (PVK)-based blue emission layer with iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C2′)picolinate (FIrpic) triplet emitter blended with solution-processed 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) gave luminous efficiency of 21.1 cd/A at a brightness of 6220 cd/m2 with an external quantum efficiency (EQE) of 10.6%. Blue PHOLEDs with solution-incorporated HTMs turned out to be 50% more efficient compared to the reference device without HTMs. The high hole mobility, high triplet energy of HTM, and favorable energy transfer between HTM blended PVK host and FIrpic blue dopant were found to be important factors for achieving high device performance. The results are instructive to design and/or select proper hole-transport materials in solution-processed single emission layer.

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“…Therefore, in order to optimize the efficiency of the devices, a variety of methods have been presented. The following are some examples: doping phosphorescence material into the emitting layer to enhance the performance of the device [1][2][3], improving the balance between holes and electrons within the recombination zone of the excitons [4][5][6][7], or increasing the efficiency of light extraction by decreasing the waveguide effect on the edge of the glass [8,9]. These methods can enhance the performances of OLEDs, but these methods also increased the production complexity of OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Enhancement and Reduction of Nonradiative Decay Process in Organic Light-Emitting Diodes by Gold Nanoparticles

et al. 2016

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Abstract:The influences of gold nanoparticles (GNPs) and the buffer layer on the performance of organic light-emitting diodes are investigated in this study. The GNPs are doped into poly (3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and the buffer layer is introduced between the hole-transport layer and emitting layer. The GNPs are found to have the surface plasmon resonance at a wavelength of 530 nm when the mean particle size of the GNPs is 10 nm. The current efficiency of the device, at a current density of 145 mA/cm 2 , with GNPs and a buffer layer of 6 nm is about 1.93 times higher than that of the device with prime PEDOT:PSS because the GNPs will generate the surface plasmon resonance effect in the device and the buffer layer can considerably decrease the quenching of the fluorescence.

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Efficient triplet exciton confinement of white organic light-emitting diodes using a heavily doped phosphorescent blue emitter

Cited by 10 publications

References 15 publications

Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

Solution-Processed Efficient Blue Phosphorescent Organic Light-Emitting Diodes (PHOLEDs) Enabled by Hole-Transport Material Incorporated Single Emission Layer

Enhancement and Reduction of Nonradiative Decay Process in Organic Light-Emitting Diodes by Gold Nanoparticles

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