Events

Chalk and Talk Event (In Person) - Bancroft Building 2.40 Presentation by Jianpu Wang, Changzhou University/Nanjing Tech University, China

Date: Thursday 12 September 2024 11:00 - 12:30

Location: Bancroft Building 2.40

Jianpu Wang has been a professor and vice president at Changzhou University since 2023, after holding the position of professor at Nanjing Tech University from 2013 to 2022. He has been awarded the National Science Fund for Distinguished Young Scholars (2017) and selected as Changjiang Scholar (2018). His research interests are organic/perovskite semiconductor devices and device physics, aiming for display and energy applications. He worked as a research engineer at Samsung Electronics in South Korea from 2003 to 2006, developing OLED displays by using ink-jet printing technology. From 2006 to 2009, he carried out his Ph.D. studies on organic semiconductor/inorganic nanocrystal devices at Cavendish Laboratory, University of Cambridge. He was then a postdoctoral research associate studying organic magnetic fields at Cavendish from 2009 to 2013.

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, such as high photoluminescence yield, good charge mobility and excellent color purity. In this talk, I will present our effort to boost the efficiency of perovskite LEDs to a high level which is comparable to organic LEDs.[1–10] More importantly, organic LEDs are difficult to maintain high efficiency at high current densities due to their excitonic nature and low charge mobilities. Low temperature solution-processed perovskite LEDs demonstrate remarkably high efficiency at high current densities, suggesting unique potential to achieve large size planar LEDs with high efficiency at high brightness.

References

[1] J. Wang, N. Wang, Y. Jin, J. Si, Z.-K. Tan, H. Du, L. Cheng, X. Dai, S. Bai, H. He, Z. Ye, M. L. Lai, R. H. Friend, W. Huang, Adv. Mater. 2015, 27, 2311.

[2] N. Wang, L. Cheng, R. Ge, S. Zhang, Y. Miao, W. Zou, C. Yi, Y. Sun, Y. Cao, R. Yang, Y. Wei, Q. Guo, Y. Ke, M. Yu, Y. Jin, Y. Liu, Q. Ding, D. Di, L. Yang, G. Xing, H. Tian, C. Jin, F. Gao, R. H. Friend, J. Wang, W. Huang, Nat. Photonics 2016, 10, 699.

[3] Y. Cao, N. Wang, H. Tian, J. Guo, Y. Wei, H. Chen, Y. Miao, W. Zou, K. Pan, Y. He, H. Cao, Y. Ke, M. Xu, Y. Wang, M. Yang, K. Du, Z. Fu, D. Kong, D. Dai, Y. Jin, G. Li, H. Li, Q. Peng, J. Wang, W. Huang, Nature 2018, 562, 249.

[4] W. Zou, R. Li, S. Zhang, Y. Liu, N. Wang, Y. Cao, Y. Miao, M. Xu, Q. Guo, D. Di, L. Zhang, C. Yi, F. Gao, R. H. Friend, J. Wang, W. Huang, Nat. Commun. 2018, 9, 608.

[5] Y. Miao, Y. Ke, N. Wang, W. Zou, M. Xu, Y. Cao, Y. Sun, R. Yang, Y. Wang, Y. Tong, W. Xu, L. Zhang, R. Li, J. Li, H. He, Y. Jin, F. Gao, W. Huang, J. Wang, Nat. Commun. 2019, 10, 3624.

[6] Y. Miao, L. Cheng, W. Zou, L. Gu, J. Zhang, Q. Guo, Q. Peng, M. Xu, Y. He, S. Zhang, Y. Cao, R. Li, N. Wang, W. Huang, J. Wang, Light Sci. Appl. 2020, 9, 89.

[7] Y. He, J. Yan, L. Xu, B. Zhang, Q. Cheng, Y. Cao, J. Zhang, C. Tao, Y. Wei, K. Wen, Z. Kuang, G. M. Chow, Z. Shen, Q. Peng, W. Huang, J. Wang, Adv. Mater. 2021, 33, 2006302.

[8] H. Min, J. Chang, Y. Tong, J. Wang, F. Zhang, Z. Feng, X. Bi, N. Chen, Z. Kuang, S. Wang, L. Yuan, H. Shi, N. Zhao, D. Qian, S. Xu, L. Zhu, N. Wang, W. Huang, J. Wang, Nat. Photonics 2023, 17, 755.

[9] H. Min, N. Wang, N. Chen, Y. Tong, Y. Wang, J. Wang, J. Liu, S. Wang, X. Wu, P. Yang, H. Shi, C. Zhuo, Q. Chen, J. Li, D. Zhang, X. Lu, C. Zhu, Q. Peng, L. Zhu, J. Chang, W. Huang, J. Wang, Nat. Nanotechnol. 2024, 19, 632.

[10] M. Li, Y. Yang, Z. Kuang, C. Hao, S. Wang, F. Lu, Z. Liu, J. Liu, L. Zeng, Y. Cai, Y. Mao, J. Guo, H. Tian, G. Xing, Y. Cao, C. Ma, N. Wang, Q. Peng, L. Zhu, W. Huang, J. Wang, Nature 2024, 630, 631.