DataVXAdvanced Optical MaterialsPaper
journal article·2019-10

Spontaneous Formation of Nanocrystals in Amorphous Matrix: Alternative Pathway to Bright Emission in Quasi‐2D Perovskites

Fangzhou Liu, Christopher Chang Sing Chan, Chao Ma, Ho Won Tam, Tik Lun Leung, Jingyang Lin, Aleksandra B. Djurišić, Kam Sing Wong, Jasminka Popović, Alan Man Ching Ng, Wai Kin Chan, Wei Chen, Zhubing He, Ayotunde Emmanuel Adesina, Yishu Foo, Juan Antonio Zapien

Advanced Optical Materials· Volume 7· Issue 19
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Source abstract

Abstract

Abstract Significant enhancement of the light emission in Ruddlesden–Popper organic–inorganic halide perovskites is obtained by antisolvent induced spontaneous formation of nanocrystals in an amorphous matrix. This morphology change results in the passivation of defects and significant enhancement of light emission and 16 times higher photoluminescence quantum yield (PLQY), and it is applicable to different spacer cations. The use of trioctylphosphine oxide results in further defect passivation leading to an increase in PLQY (≈2.3 times), the suppression of lower energy emission in low temperature photoluminescence spectra, the dominance of radiative recombination, and the disappearance of thermal quenching of the luminescence. The proposed method offers a reproducible, controllable, and antisolvent‐insensitive alternative to energy landscape engineering to utilize energy funneling phenomenon to achieve bright emission. Instead of facilitating fast energy transfer from lower to higher number of perovskite sheets to prevent nonradiative losses, it is demonstrated that defects can be effectively passivated via morphology control and the use of a passivating agent, so that bright emission can be obtained from single phase nanocrystals embedded in amorphous matrix, resulting in light emitting diodes with a maximum external quantum efficiency of 2.25%.
Source: crossref · Quality: baseline

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

Department of Physics The University of Hong Kong Pokfulam Road Hong Kong

Department of Physics The Hong Kong University of Science and Technology Clearwater Bay Hong Kong

Department of Physics Southern University of Science and Technology No. 1088, Xueyuan Road Shenzhen 518055 Guangdong China

Center of Excellence for Advanced Materials and Sensing Devices Division for Materials Physics Laboratory for Synthesis and Crystallography of Functional Materials Rud_er Bošković Institute Bijenicˇka 54 Zagreb 10000 Croatia

Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong

Department of Materials Science and Engineering Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG) No. 1088, Xueyuan Road Shenzhen 518055 Guangdong China

Department of Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong

Funding

University of Hong Kong · Research Grants Council, University Grants Committee · Science, Technology and Innovation Commission of Shenzhen Municipality · Ministry of Science and Technology of the People's Republic of China

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