首页|利用溶液加工的界面阻挡层实现高效三维和准二维金属卤化物钙钛矿发光二极管

利用溶液加工的界面阻挡层实现高效三维和准二维金属卤化物钙钛矿发光二极管

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为了保护金属卤化物钙钛矿发光层免受强酸性聚合物(poly-(3,4-ethylenedioxythiophene):poly(styre-nesulfonic acid),PEDOT:PSS)的腐蚀,一种具有空穴传输能力的有机小分子材料(N,N-dicarbazolyl-3,5-benzene,mCP)被当作界面阻挡层引入三维钙钛矿发光层(CsPbBr3)和PEDOT:PSS之间.研究表明,mCP不仅可以从空间上隔离CsPbBr3和PEDOT:PSS,抑制PEDOT:PSS对CsPbBr3发光层的降解,还可以使钙钛矿薄膜的覆盖率更高,颗粒更小,提高薄膜质量,减少薄膜缺陷对激子的淬灭.同时,mCP的引入可以提高空穴注入和传输能力,使得相同电压下形成的激子更多;由于mCP具有比PEDOT:PSS更高的最低电子不占有态和更大的能隙,能更好地将激子限制在发光层中,进一步提高激子的发光辐射复合和器件的电致发光效率.与原始不加mCP的器件相比,基于mCP的3D CsPbBr3钙钛矿发光二极管(Perovskite light-emitting diode,PeLED)的电致发光性能得到了显著提升,获得了 4.86 cd/A最大电流效率.接着,这种方法在基于PEA2Csn-1PbnBr3n+1的准二维PeLED中也被证实是可行的,器件的最大电流效率被提升到24.79 cd/A.
Efficient 3D and quasi-2D metal halide perovskite light-emitting diodes by a solution processed interface barrier layer
An organic small molecular material(N,N-dicarbazolyl-3,5-benzene,mCP)with hole transporting ability was introduced as an interfacial barrier layer between the metal halide perovskite luminescent layer(CsPbBr3)and the strongly acidic polymer poly-(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid)(PEDOT:PSS)to protect CsPbBr3 from corrosion.The study showed that mCP not only can spatially isolate CsPbBr3 and PEDOT:PSS to inhibit the degradation of PEDOT:PSS on the CsPbBr3 luminescent layer,but also can improve the film quality,making the coverage of the perovskite film higher and the grains smaller,and thus reducing the quenching defect.At the same time,the introduction of mCP can improve the hole injection and transport ability,resulting in more excitons generated under the same voltage.Since mCP has a higher lowest e-lectron unoccupied state and a larger energy gap than PEDOT:PSS,which can confine excitons better in the lu-minescent layer,improving the radiation recombination of excitons,thereby improving the electroluminescence efficiency of the device further.Compared with the reference device without mCP,the electroluminescence per-formance of the 3D CsPbBr3 perovskite light-emitting diode(PeLED)based on mCP was significantly improved,achieving a maximum current efficiency of 4.86 cd/A.Subsequently,this method was also proven to be feasible in quasi-two-dimensional PeLEDs based on PEA2Csn-1PbnBr3n+1,exhibiting the maximum current efficiency of 24.79 cd/A.

exciton blockinghole transportelectroluminescenceperovskite light-emitting diode

王林强、贾亚兰、徐强、朱志新、周科文、高春红、潘书生

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广州大学物理与材料科学学院,广东广州 510006

西南大学物理科学与技术学院,重庆 400715

广州大学硅基信息材料与集成电路设计广东普通高校重点实验室,广东广州 510006

广州大学黄埔研究院研究生院先进信息材料研究中心,广东广州 510555

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激子阻挡 空穴传输 电致发光 钙钛矿发光二极管

Key Discipline of Materials Science and Engineering,Bureau of Education of Guangzhou"2+5"Significant Academic Hubs and Platforms of Guangzhou University

202255464PT252022016

2024

广州大学学报(自然科学版)
广州大学

广州大学学报(自然科学版)

影响因子：0.293
ISSN：1671-4229
年,卷(期)：2024.23(1)
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