Electroluminescent Organic and Quantum Dot LEDs: The State of the Art

Kathirgamanathan, Poopathy; Bushby, Lisa M.; Kumaraverl, Muttulingam; Ravichandran, Seenivasagam; Surendrakumar, Sivagnanasundram

doi:10.1109/jdt.2015.2418279

Cited by 53 publications

(32 citation statements)

References 44 publications

(50 reference statements)

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“…For the reference LEC, a layer of poly(3,4-ethylenedioxythiophene):poly-(styrenesulfonate) (PEDOT:PSS) was spin-coated onto a cleaned glass substrate with a 150 nm thick sputtered indium tin oxide (ITO) anode. After baking the PEDOT:PSS layer for 20 min at 150°C, the active LEC layer containing a blend of a long-term stable yellow ionic iridium complex ([Ir(ppy) 2 6 ] − ) was spin-coated on top.…”

Section: ■ Conclusionmentioning

confidence: 99%

Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Frohleiks

Wepfer

Keleştemur

et al. 2016

ACS Appl. Mater. Interfaces

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A new type of light-emitting hybrid device based on colloidal quantum dots (QDs) and an ionic transition metal complex (iTMC) light-emitting electrochemical cell (LEC) is introduced. The developed hybrid devices show light emission from both active layers, which are combined in a stacked geometry. Time-resolved photoluminescence experiments indicate that the emission is controlled by direct charge injection into both the iTMC and the QD layer. The turn-on time (time to reach 1 cd/m 2 ) at constant voltage operation is significantly reduced from 8 min in the case of the reference LEC down to subsecond in the case of the hybrid device. Furthermore, luminance and efficiency of the hybrid device are enhanced compared to reference LEC directly after device turn-on by a factor of 400 and 650, respectively. We attribute these improvements to an increased electron injection efficiency into the iTMC directly after device turn-on.

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Section: ■ Conclusionmentioning

confidence: 99%

Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Frohleiks

Wepfer

Keleştemur

et al. 2016

ACS Appl. Mater. Interfaces

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“…QD displays have been recently released on the market with promising appealing characteristics, such as a wider color gamut due to spectrally pure emissions with narrow bandwidths. QD are a new class of nanomaterials that provide vivid colors in an energy‐efficient way . Hence we consider the QD technology to assure improvement of the digital reproduction of goniochromatic colors.…”

Section: Introductionmentioning

confidence: 99%

“…QD are a new class of nanomaterials that provide vivid colors in an energy-efficient way. [10][11][12] Hence we consider the QD technology to assure improvement of the digital reproduction of goniochromatic colors. Although high saturated primaries red, green, and blue are present on QD displays, which guarantees a wide color gamut, but there is still an area lacking that needs covering when considering the extended range of goniochromatic colors on CIE1931 xy-diagrams.…”

Section: Introductionmentioning

confidence: 99%

A multi‐primary empirical model based on a quantum dots display technology

Huraibat

Perales

Viqueira

et al. 2020

Color Research & Application

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In this work, we built a multi‐primary display model based on the new quantum dots (QD) technology to enlarge the display color gamut. In this way, first the emission spectral radiance curves of the three RGB channels of a commercial QD display were fitted to a four‐parameter function. From this modeling, it is possible to gain new theoretical color primaries by selecting new spectral peaks (cyan, yellow, magenta, and/or additional RGB primaries) and imposing some colorimetric conditions for the resulting white of this proposed theoretical multi‐primary display. Proper characterization to assess the performance of the display was conducted to know if the basic “gain‐offset‐gamma” (GOG) model can be used for direct and inverse color reproduction (from RGB to CIE‐XYZ, and vice versa). The GOG model was found to well characterize this display. The spatial uniformity of the display was also evaluated in luminance and color chromaticity terms. Finally, with the primaries modeling and color characterization based on the GOG model, a 5‐primary model (RGBYC) was tested. The evaluation of this theoretical RGBYC display model confirms the gamut enlargement, which can also improve goniochromatic color reproduction.

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“…Looking forward, the technology that can take best advantage of all the unique properties of QDs is QD‐LED (or QDEL). Exhibiting excellent color performance, elegant pixel design, and color patterning by low‐cost printing process, QD‐LED has great potential to be the next generation display technology …”

Section: Introductionmentioning

confidence: 99%

High efficiency heavy metal free QD‐LEDs for next generation displays

et al. 2019

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In this paper, we report on our progress on developing heavy metal free (or Cdfree) QD-LEDs for all three colors. With improvement in synthesis, we have developed high quantum yield heavy metal free quantum dots (more than 95% for red and green and more than 80% for blue), with peak wavelengths suitable for BT.2020. Building upon these high-performance quantum dots and through novel device structure design and optimization we have demonstrated high efficiency heavy metal free QD-LEDs with EQE = 16.9%, 13%, 9% for red, green, and blue, respectively. Specifically, we report a systematic study on the impact of shell thickness to the device efficiency performance.

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Electroluminescent Organic and Quantum Dot LEDs: The State of the Art

Cited by 53 publications

References 44 publications

Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

Quantum Dot/Light-Emitting Electrochemical Cell Hybrid Device and Mechanism of Its Operation

A multi‐primary empirical model based on a quantum dots display technology

High efficiency heavy metal free QD‐LEDs for next generation displays

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