Effect of Mg0.71Zn0.29O electron transport layer on violet/blue emission of CsPbCl3 LED

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-28 DOI:10.1016/j.jphotochem.2025.116309

Weifang Zhang, Shenwei Wang, Zhengmao Wen, Qingxue Zhao, Lixin Yi

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Abstract

In this study, the electron transport layer Mg_0.71Zn_0.29O was deposited using magnetron sputtering in a violet/blue CsPbCl₃ light-emitting diode (LED) device. Apart from facilitating electron transfer, a crucial aspect was hole blocking. The high crystallinity of Mg_0.71Zn_0.29O not only maintained the grain size of CsPbCl₃ films but also enhanced their crystalline quality. The crystal quality of the luminescent layer played a vital role in the performance of the subsequent devices. The valence band top and conduction band bottom energies of Mg_0.71Zn_0.29O were determined to be −9.87 eV and −4.45 eV respectively, which matched with the luminescent layer energy level. Energy level matching is the key to manufacturing efficient LED. Ultimately, an optimal thickness of 9 nm for Mg_0.71Zn_0.29O resulted in the highest electroluminescence (EL) intensity at a driving voltage of 8 V. Devices incorporating Mg_0.71Zn_0.29O exhibited significantly enhanced EL compared to those without it. This improvement was attributed to the effective inhibition of hole injection into the electron transport layer by the lower valence band level of Mg_0.71Zn_0.29O, thereby increasing carrier recombination likelihood. The violet/blue EL spectrum position of the device was 409 nm, the full width at half maximum was only 9.7 nm, and it had excellent luminescence monochromaticity.

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.