Pukyong National University

’Easy and reproducible PeLED synthesis method’
Professor Lee Bo-ram

For the production of perovskite light emitting diodes (PeLEDs) emerging as next generation displays, new nanocrystal synthesis methods with easy and reproducible methods have been developed. Professor Lee Bo-ram (Department of Physics) of Pukyong National University, developed a red emitter using ethylammonium lead iodide (CH3NH3PbI3). Professor Lee succeeded in developing a method for synthesizing perovskite nanocrystals with high luminescence and stability by controlling the ratio of ligand, toluene and as well as temperature of toluene when mixing CH3NH3PbI3 nanocrystalline material with ligand and toluene, which are the solutions. The nanocrystalline solution had a result of variable emission of a wavelength of 660 to 705nm in the red region, and showed photoluminescence quantum yield (PLQY) of more than 93%. In addition, as a result of mixing the solution with bromide to produce a PeLED device, it emitted red light at 635nm and exhibited a maximum electroluminescence external quantum efficiency (EL-EQE) of 2.75%. With the support of the National Research Foundation of Korea (NRF)’s new researcher support project, Professor Lee of Pukyong Natioanl University and Professor Henry J. Snaith of the University of Oxford, England, Professor Richard H. Friend of the University of Cambridge, and Professor Song Myeong-hoon of the Ulsan National Institute of Science and Technology (UNIST) conducted the research and achieved this result. The paper, 「Facile Synthesis of Stable and Highly Luminescent Methylammonium Lead Halide Nanocrystals for Efficient Light Emitting Devices」 containing the results of this research, has been published in January 2019 in the international journal which is famous in chemistry, <JOURNAL OF THE AMERICAN CHEMICAL SOCIETY> (IF = 14.357). <기사 보러가기(클릭!)>

△ Graph image of nanocrystal solution and red light emission area.


20 February 2019

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  이보람 brlee@pknu.ac.kr
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