Fast-response, high-stability, and high-efficiency full-color quantum dot light-emitting diodes with charge storage layer

Zhu, Yuan; Liu, Yang; Hu, Hailong; Xu, Zhiai; Bai, Jieyu; Yang, Kaiyu; Guo, Tailiang; Li, Fushan

doi:10.1007/s40843-021-1796-6

Cited by 9 publications

(7 citation statements)

References 32 publications

(20 reference statements)

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“…Electroluminescence is received by the photodetector for postsynaptic brightness (PSB) detection. Hybrid quantum dots (QDs) used in the light-emitting layer can emit light of specific color in response to electric field 7 , 50 – 53 , and the emission color can be changed by varying the magnitude of the electric field. Based on this, SMPS with synapse-like and multi-wavelength light output can be realized by tuning the electric field intensity generated by the contact intensity.…”

Section: Resultsmentioning

confidence: 99%

A sensory memory processing system with multi-wavelength synaptic-polychromatic light emission for multi-modal information recognition

Shan

Chen

et al. 2023

Nat Commun

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Realizing multi-modal information recognition tasks which can process external information efficiently and comprehensively is an urgent requirement in the field of artificial intelligence. However, it remains a challenge to achieve simple structure and high-performance multi-modal recognition demonstrations owing to the complex execution module and separation of memory processing based on the traditional complementary metal oxide semiconductor (CMOS) architecture. Here, we propose an efficient sensory memory processing system (SMPS), which can process sensory information and generate synapse-like and multi-wavelength light-emitting output, realizing diversified utilization of light in information processing and multi-modal information recognition. The SMPS exhibits strong robustness in information encoding/transmission and the capability of visible information display through the multi-level color responses, which can implement the multi-level pain warning process of organisms intuitively. Furthermore, different from the conventional multi-modal information processing system that requires independent and complex circuit modules, the proposed SMPS with unique optical multi-information parallel output can realize efficient multi-modal information recognition of dynamic step frequency and spatial positioning simultaneously with the accuracy of 99.5% and 98.2%, respectively. Therefore, the SMPS proposed in this work with simple component, flexible operation, strong robustness, and highly efficiency is promising for future sensory-neuromorphic photonic systems and interactive artificial intelligence.

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Section: Resultsmentioning

confidence: 99%

A sensory memory processing system with multi-wavelength synaptic-polychromatic light emission for multi-modal information recognition

Shan

Chen

et al. 2023

Nat Commun

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show abstract

Section: Resultsmentioning

confidence: 99%

“…The increased hole mobility and decreased barrier energy will accelerate hole transfer from the HTL to the QDs, and promote hole transport in the QLEDs, thus matching the electron mobility of the QLEDs. 38–40 The trap density for devices based on TFB, P-TFB and PVK are calculated using eqn (3): 19 where ε 0 is the vacuum permittivity, ε r is the relative dielectric constant, V TFL is the trap-filled limit voltage, e is the electron charge, and d is the thickness of the film. The defect density of the TFB, P-TFB, and PVK films is 1.78 × 10 21 , 1.73 × 10 21 and 1.83 × 10 21 cm −3 , respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

High-efficiency quantum-dot light-emitting diodes enabled by boosting the hole injection

Cheng

Liu

et al. 2022

J. Mater. Chem. C

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“…Quantum dot light-emitting diodes (QLEDs) are considered to be one of the dominant display technologies of the future due to the tunable band gap, high efficiency, narrow bandwidth, and good stability of quantum dots (QDs). − Because heavy metals are increasingly prohibited from being used in electronic devices, environmentally friendly indium phosphide (InP) QDs with a tunable emission spectrum over the entire visible region are ideal candidates. Currently, for InP QLEDs, the main problems to be tackled are the wide emission spectrum and relatively low efficiency.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of InP Multishell Quantum Dots for Narrow-Bandwidth Light-Emitting Devices

Zhao

Zheng

et al. 2023

ACS Appl. Nano Mater.

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With tunable emission in the full visible region, the ecofriendly InP quantum dots (QDs) show unique application prospects in light-emitting devices. At present, InP QDs suffer from wide-bandwidth emission, especially for electroluminescence (EL), which hinders their applications in high-performance display devices. Here, we report a facile one-pot synthesis of narrow-bandwidth InP/ZnSeS/ZnS QDs using a safe phosphorus source of tris(dimethylamino)phosphine, in which the ZnSeS inner-shell layer is formed via temperature-gradient solution growth from 240 to 280 °C. The synthesized green QDs have a high photoluminescence quantum yield (PLQY) of 91% and full width at half-maximum (fwhm) of 36 nm. Moreover, the resultant quantum dot light-emitting devices (QLEDs) also show a narrow fwhm of 42 nm, which is the narrowest emission of green InP QLEDs based on a safe phosphorus source reported so far. Further modulation of the electron injection into the device by inserting a thin layer of lithium fluoride results in a peak external quantum efficiency of 5.56%.

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Fast-response, high-stability, and high-efficiency full-color quantum dot light-emitting diodes with charge storage layer

Cited by 9 publications

References 32 publications

A sensory memory processing system with multi-wavelength synaptic-polychromatic light emission for multi-modal information recognition

A sensory memory processing system with multi-wavelength synaptic-polychromatic light emission for multi-modal information recognition

High-efficiency quantum-dot light-emitting diodes enabled by boosting the hole injection

One-Pot Synthesis of InP Multishell Quantum Dots for Narrow-Bandwidth Light-Emitting Devices

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