ZnSeTe blue top-emitting QLEDs with color saturation near Rec.2020 standards and efficiency over 18.16%
ZnSeTe blue Cd-free quantum dot (QD) has emerged as a promising emitter for display applications due to its nontoxicity, tunable wavelength, and high efficiency. However, ZnSeTe-based quantum-dot light-emitting diodes (QLEDs) usually exhibit unsaturated emissions with broad spectra. Herein, a top-emitting structure, equipped with a transparent indium-zinc-oxide (IZO) top electrode and an IZO phase tuning layer (PTL), is developed to modulate the emission spectra and the efficiency of the devices. Saturated blue emissions with color coordinates beyond Recommendation ITU-R BT.709 (Rec.709) and near Rec.2020 standards are achieved. Moreover, benefiting from the improved outcoupling efficiency and the enhanced charge balance, the top-emitting QLED demonstrates a high external quantum efficiency of 15.14%, which is further improved to 18.16% by capping the devices with SiO nanospheres. Simulation analysis reveals that the surface plasmon polariton (SPP) losses are effectively reduced by applying a 100 nm PTL, leading to an outcoupling efficiency of 41.2% at a wavelength of 478 nm. Due to the simultaneously enhanced color saturation and efficiency, a high chroma efficiency (current efficiency/y coordinate in Commission Internationale de l’Eclairage chart) of 123 is obtained. The developed top-emitting architecture could enable the realization of efficient and saturated QLEDs for wide color gamut high-definition display applications. [Figure not available: see fulltext.].
First ; Corresponding
National Natural Science Foundation of China ; Shenzhen Science and Technology Program["JCYJ20210324105400002","JCYJ20220530113809022"] ; Guangdong University Research Program[2020ZDZX3062]
|WOS Research Area|
Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied
|WOS Accession No|
|EI Accession Number|
Color ; Electromagnetic wave polarization ; Emission spectroscopy ; II-VI semiconductors ; Nanocrystals ; Organic light emitting diodes (OLED) ; Quantum efficiency ; Refractive index ; Silica ; Surface plasmon resonance ; Zinc oxide
|ESI Classification Code|
Electromagnetic Waves:711 ; Semiconducting Materials:712.1 ; Semiconductor Devices and Integrated Circuits:714.2 ; Light/Optics:741.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Quantum Theory; Quantum Mechanics:931.4 ; Crystalline Solids:933.1
Cited Times [WOS]:4
|Document Type||Journal Article|
|Department||Department of Electrical and Electronic Engineering|
Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
|First Author Affilication||Department of Electrical and Electronic Engineering|
|Corresponding Author Affilication||Department of Electrical and Electronic Engineering|
|First Author's First Affilication||Department of Electrical and Electronic Engineering|
Yuan，Cuixia,Tian，Fengshou,Chen，Shuming. ZnSeTe blue top-emitting QLEDs with color saturation near Rec.2020 standards and efficiency over 18.16%[J]. Nano Research,2022.
Yuan，Cuixia,Tian，Fengshou,&Chen，Shuming.(2022).ZnSeTe blue top-emitting QLEDs with color saturation near Rec.2020 standards and efficiency over 18.16%.Nano Research.
Yuan，Cuixia,et al."ZnSeTe blue top-emitting QLEDs with color saturation near Rec.2020 standards and efficiency over 18.16%".Nano Research (2022).
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