Prof. Bin A. Hu Profile

Prof. Bin A. Hu

Professor at Univ of Tennessee Knoxville

SPIE Involvement:

Editorial Board Member: Journal of Photonics for Energy | Author | Editor

Proceedings Article | 3 October 2022 Presentation

Linear and nonlinear light-emitting behaviors of charge-transfer excitons in heterostructured perovskites (Conference Presentation)

Bin Hu

Proceedings Volume PC12208, PC122080B (2022) https://doi.org/10.1117/12.2637439

KEYWORDS: Excitons, Perovskite, Polarization, Optoelectronics, Semiconductors, X-rays, Scintillation, Optical properties, Nonlinear optics, Luminescence

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Proceedings Article | 1 August 2021 Presentation

Rational design of metal-free organic chromophores to form efficient room temperature persistent luminescent molecular crystals via H-bond-directed supramolecular self-assembly

Catherine Demangeat, Yixuan Dou, Bin Hu, Yann Bretonniere, Chantal Andraud, Anthony D'Aleo, Jeong Weon Wu, Eunkyoung Kim, Tangui Le Bahers, André-Jean Attias

Proceedings Volume 11808, 118080N (2021) https://doi.org/10.1117/12.2594420

KEYWORDS: Molecular self-assembly, Crystals, Molecular electronics, Chromophores, Phosphorescence, Luminescence, Quantum efficiency, Organic electronics, Molecules, Data storage

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Proceedings Article | 1 August 2021 Presentation

Spin-orbital coupling effects on light-emitting properties in organic and perovskite materials through orbital and spin polarizations in spontaneous and stimulated emission

Bin Hu

Proceedings Volume 11808, 118081C (2021) https://doi.org/10.1117/12.2594785

KEYWORDS: Perovskite, System on a chip, Spin polarization, Excitons, Molecules, Crystals, Polarization, Organic materials, Luminescence

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Proceedings Article | 5 March 2021 Presentation

Rational design of metal-free organic chromophores to form efficient long-lived room-temperature phosphorescent molecular crystals via H-bond-directed supramolecular self-assembly

Catherine Demangeat, Yixuan Dou, Bin Hu, Yann Bretonniere, Chantal Andraud, Anthony D'Aleo, Jeong Weon Wu, Eunkyoung Kim, Tangui Le Bahers, André-Jean Attias

Proceedings Volume 11683, 116830J (2021) https://doi.org/10.1117/12.2576848

KEYWORDS: Molecular self-assembly, Crystals, Molecular electronics, Chromophores, Phosphorescence, Quantum efficiency, Phosphorescent materials, Organic electronics, Molecules, Luminescence

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Proceedings Article | 22 August 2020 Presentation

Revealing self-stimulated dissociation in non-fullerene organic bulk-heterojunction solar cells

Bin Hu

Proceedings Volume 11474, 1147409 (2020) https://doi.org/10.1117/12.2570137

KEYWORDS: Solar cells, Interfaces, Molecules, Organic photovoltaics, Photovoltaics, Polarization, Excitons, Dipolar polarization

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Proceedings Article | 20 August 2020 Presentation

Deeper understanding on controlling dark and bright states in organic and perovskite LEDs

Bin Hu

Proceedings Volume 11473, 1147310 (2020) https://doi.org/10.1117/12.2570004

KEYWORDS: Perovskite, Light emitting diodes, System on a chip, Organic materials

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Proceedings Article | 19 September 2017 Presentation

Understanding spin-dependent processes in TADF light-emitting materials based on magneto-optical studies (Conference Presentation)

Bin Hu

Proceedings Volume 10362, 103620E (2017) https://doi.org/10.1117/12.2276274

KEYWORDS: Doping, Polarization, Process control, Luminescence, Molecules, Resistance, Magnetism, Nanoparticles, Liquids

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This presentation reports our recent studies on the understanding of spin-dependent processes in TADF (Thermally Activated Delayed Fluorescence) light-emitting materials based on magneto-optical studies. Recently, we have performed magneto-optical studies on TADF light-emitting molecules (DMAC-TRZ) by using magneto-photoluminescence (magneto-PL). Our magneto-PL studies provide the first evidence that the TADF is a spin-dependent process occurring in charge-transfer states. Essentially, the key spin-dependent process, namely spin mixing, necessarily required to activate the TADF, is determined by the competition between two critical parameters: (i) exchange interaction which functions as a resistance force to the TADF and (ii) spin-orbital coupling which acts as a driving force to the TADF. Therefore, controlling the exchange interaction and spin-orbital coupling becomes a critical issue in the development of highly efficient TADF light-emitting materials. By using magneto-PL studies, we further found that, doping soluble magnetic nanoparticles (surface-modified Fe3O4) can conveniently change the exchange interaction and spin-orbital coupling, and consequently alters the TADF rate. At low doping concentrations, the spin-orbital coupling is enhanced, leading to an increase on TADF rate. However, at high doping concentrations, the exchange interaction is increased, causing a decrease on the TADF rate. Furthermore, we studied the polarization effects of spin mixing in liquid TADF materials by using various solvents with different polarities. We observed that increasing the host polarization can directly weaken the spin mixing and leads to a decrease on the TADF rate. This experimental observation indicates that host polarization can weaken the spin-orbital coupling and thus decreases the driving force to TADF. Clearly, the magneto-PL studies provide an insightful understanding on the spin-dependent process to control the TADF rate in organic light-emitting materials.

Showing 5 of 7 publications

SPIE Conference Volume | 21 December 2012

LED and Display Technologies II

SPIE Conference Volume | 23 February 2012

Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Devices and Integration

Conference Committee Involvement (3)

LED and Display Technologies II

6 November 2012 | Beijing, China

Optoelectronic Devices and Integration

2 November 2011 | Wuhan, China

LED and Display Technologies

18 October 2010 | Beijing, China

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