DataVXAdvanced Optical MaterialsPaper
journal article·2018-06Open access

Highly Efficient Green Light‐Emitting Diodes from All‐Inorganic Perovskite Nanocrystals Enabled by a New Electron Transport Layer

Baiquan Liu, Lin Wang, Haoshuang Gu, Handong Sun, Hilmi Volkan Demir

Advanced Optical Materials· Volume 6· Issue 11
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Abstract

Abstract Adopting proper electron transport layers (ETLs) is essential to high‐performance all‐inorganic perovskite light‐emitting diodes (PeLEDs). However, the effect of ETLs has not been comprehensively investigated in all‐inorganic nanocrystal PeLEDs, while 2,2′,2′′‐(1,3,5‐benzenetriyl) tris‐[1‐phenyl‐1H‐benzimidazole] (TPBi) is the most common ETL. Herein, a novel strategy is proposed to enhance the efficiency of nanocrystal PeLEDs. Tris(8‐hydroxyquinoline) aluminum (Alq3) is incorporated into TPBi to form a new ETL TPBi/Alq3/TPBi, simultaneously enabling charge balance and confinement. The green PeLED with new ETL exhibits a maximum external quantum efficiency (EQE) of 1.43%, current efficiency of 4.69 cd A−1, and power efficiency of 1.84 lm W−1, which are 191%, 192%, and 211% higher than those of PeLEDs with conventional ETL TPBi, respectively. Significantly, the EQE is 36‐fold higher than that of PeLED with high electron mobility ETL. Impressively, the full width at half‐maximum of electroluminescence emission is 16 nm, which is the narrowest among CsPbBr3 PeLEDs. The findings may present a rational strategy to enhance the device engineering of all‐inorganic PeLEDs.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Luminous! Center of Excellence for Semiconductor Lighting and Displays School of Electrical and Electronic Engineering and School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639798 Singapore

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore

Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices Faculty of Physics & Electronic Sciences Hubei University Wuhan 430062 China

Centre for Disruptive Photonic Technologies (CDPT) School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

MajuLab CNRS‐UCA‐SU‐NUS‐NTU International Joint Research Unit Singapore

Department of Electrical and Electronics Engineering Department of Physics UNAM‐Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey

Funding

National Research Foundation · Ministry of Education - Singapore · China Scholarship Council

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