Events

Coming Colloquium

 

HONG KONG BAPTIST UNIVERSITY
Department of Physics &
Institute of Advanced Materials

 

JOINT COLLOQUIUM

 

Molecular Engineering of Organic Semiconductors

 

Speaker:
Prof. Hong Meng
School of Advanced Materials, Peking University Shenzhen Graduate School, China

 

20th June, 2018 (Wednesday)
Time: 11:00am – 12:00pm
Venue: SCT909, Science Tower, HSH Campus


Abstract
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Organic electronics based on the thin film devices, including organic thin film transistors (OTFTs), organic light emitting diodes (OLEDs), organic photovoltaics (OPVs) and organic electrochromic devices (OECs) are envisioned both great interest in academia and industry. The properties of organic semiconductor materials are directly governed by the molecule structures. In this talk I will present the recent work conducted in our lab for molecule design strategies. Examples include searching high mobility organic semiconductors (30 cm2/Vs eith Vt of 1.5 V) with unique properties for OTFT and OLED applications, fine tuning color efficiency of electrochromic materials with D-A conjugated polymers for military camouflage applications, and energy level controlling of hole transport materials and interface engineering of materials for perovskite solar cell applications. Detailed studies on the photoelectronic properties as well as the device performance of these new semiconductors and interface materials are discussed.





HONG KONG BAPTIST UNIVERSITY
Department of Physics &
Institute of Advanced Materials

 

JOINT COLLOQUIUM

 

Perovskite Light-Emitting Diodes Based on Solution-Processed, Self-Organized Multiple Quantum Wells

 

Speaker:
Professor Jianpu Wang
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM),
Nanjing Tech University

 

15th June, 2018 (Friday)
Time: 11:00am – 12:00pm
Venue: SCT909, Science Tower, HSH Campus


Abstract
**********

Solution-processed light-emitting diodes (LEDs) are attractive for applications in low-cost, large-area lighting sources and displays. Organometal halide perovskites can be processed from solutions at low temperatures to form crystalline direct-bandgap semiconductors with intriguing optoelectronic properties. However, their electroluminescence (EL) efficiencies are limited by either exciton quenching in the two-dimensional perovskites or imperfect film morphologies in the three-dimensional perovskites. I will present that strikingly high-efficiency, room-temperature EL can be achieved from solution-processed hybrid perovskite films consisting of self-organized multiple quantum wells (MQWs) with an energy cascade. The perovskite MQW films deposited at low temperatures exhibit uniform morphology and high photoluminescence efficiencies resulting from efficient cascade energy transfer between the quantum wells. LEDs based on perovskite MQWs show peak external quantum efficiency (EQE) up to 11.7% with good operation stability. Our study shows that perovskite MQWs are promising as a new class of solution-processed emitters for LEDs.

References:
1. Adv. Mater. 2015, 27, 2311

2. Nat. Photonics 2016, 10, 699

3. Adv. Mater. 2017, 29, 1606600

4. Nat. Comm. 2018, 9, 608





All Interested Are Welcome!
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