7.4: Invited Paper : High‐Efficiency Inverted Quantum‐dot Light Emitting Diodes for Display

Geng

ACS Appl. Mater. Interfaces

et al. 2016

Self Cite

We report highly efficient inverted quantum-dot light emitting diodes (QLEDs) using an Al doped ZnO (AZO)/Li doped ZnO (LZO) stack electron transport layer (ETL). An introduction of the LZO layer on AZO improved the current and power efficiencies of the green (G-) QLEDs from 10.5 to 34.0 cd A and from 5.4 to 29.6 lm W, respectively. The red (R-), G-, and blue (B-) QLEDs fabricated in this work exhibited the maximum external quantum efficiencies (EQEs) of 8.4, 12.5, and 4.3%, respectively. It is found from time-resolved photoluminescence (PL) and transient electroluminescence (EL) decay that exciton loss at the interface between the ETL and the emission layer can be significantly reduced by introducing LZO.

Section: ■ Introductionmentioning

confidence: 99%

Metal-Oxide Stacked Electron Transport Layer for Highly Efficient Inverted Quantum-Dot Light Emitting Diodes

Geng

ACS Appl. Mater. Interfaces

et al. 2016

Self Cite

Quantum-Dot Based Light-Emitting Diodes

“…New Cd-free quantum dots should be introduced to commercialize the QDLED technology. ZnO cores with a MgO shell, InP-based dots and CuInS2 are three new materials that need more studies to be performed by scientists [57,58]. In 2015, Du et al studied a stable photoluminescence QDLEDs based on hydrophilic CdTe QD.…”

Section: A Brief Review Of Quantum Dot-based Light Emitting Diodes (Qmentioning

confidence: 99%

Quantum Dot-Based Light Emitting Diodes (QDLEDs): New Progress

Heydari¹,

Ghorashi²,

Han³

et al. 2017

In recent years, the display industry has progressed rapidly. One of the most important developments is the ability to build flexible, transparent and very thin displays by organic light emitting diode (OLED). Researchers working on this field try to improve this area more and more. It is shown that quantum dot (QD) can be helpful in this approach. In this chapter, writers try to consider all the studies performed in recent years about quantum dot-based light emitting diodes (QDLEDs) and conclude how this nanoparticle can improve performance of QDLEDs. In fact, the existence of quantum dots in QDLEDs can cause an excellent improvement in their efficiency and lifetime resulted from using improved active layer by colloidal nanocrystals. Finally, the recent progresses on the quantum dot-based light emitting diodes are reviewed in this chapter, and an important outlook into challenges ahead is prepared.

SID Symposium Digest of Technical Papers

“…Research on electroluminescence of colloidal quantum dots is gathering momentum as the requirement for Rec 2020 (ITU-R-BT2020) cannot be achieved by means of state of art OLED materials (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). Quantum dots offer saturated colours, narrow emission and control over the emitted wavelength by varying the quantum dot size and composition.…”

Section: Introductionmentioning

confidence: 99%

48-3:Invited Paper: Quantum Dot Electroluminescence: Towards Achieving the REC 2020 Colour Co-ordinates

Kathirgamanathan

Kumaraverl

Bushby

et al. 2016

Colloidal quantum dots have the potential to offer saturated colours satisfying the new more demanding REC 2020 (ITU-R-BT 2020) standard.We report here red quantum dot based electroluminescent devices (QLEDs) that exceed the colour co-ordinates requirement set by REC2020. We achieved colour co-ordinates of (0.712, 0.288) that exceeds the requirement. By using appropriate device architecture and quantum dot size, we achieved a very high efficiency of 4 cd/A for CIE (x,y) of (0.708, 0.292) meeting the REC 2020 specification. A world record efficiency of 10 cd/A and 5.8 lm/W for CIE (x,y) of (0.695, 0.305) has been achieved by employing a novel hole transporter. 48-3 / P. Kathirgamanathan