Pure Blue Perovskite Light‑Emitting Diodes Modified with Fluorine‑Containing Phosphine Oxide Derivatives

doi:10.19894/j.issn.1000-0518.240017

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (6): 830-838.DOI: 10.19894/j.issn.1000-0518.240017

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Pure Blue Perovskite Light‑Emitting Diodes Modified with Fluorine‑Containing Phosphine Oxide Derivatives

Run ZHANG¹^,², Hong-Mei ZHAN¹, Chen-Yang ZHAO¹, Yan-Xiang CHENG¹^,², Chuan-Jiang QIN¹^,²()

^1.State Key Laboratory of Polymer Physics and Chemistry & Key Laboratory of Polymer Science and Technology，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，China
^2.University of Science and Technology of China，Hefei 230026，China

Received:2024-01-18 Accepted:2024-03-16 Published:2024-06-01 Online:2024-07-09
Contact: Chuan-Jiang QIN
About author:cjqin@ciac.ac.cn
Supported by:
the National Natural Science Foundation of China(52203320)

Abstract

Abstract:

Achieving efficient blue electroluminescence （EL） is a crucial challenge for the commercial application of perovskite light-emitting diodes （LEDs）， especially for pure blue light with wavelengths of 465~475 nm. The main factors contributing to the low efficiency of blue light perovskite LEDs are the high defect density and difficulties in carrier injection induced by the mixed halogen and dimensionality reduction strategies. Herein， we propose an approach for achieving high-performance pure-blue perovskite LEDs by incorporating a fluorine-containing phosphine oxide derivative （PFPO）. This incorporation significantly suppresses the non-radiative recombination and fine-tunes the low-dimensional phase distribution of quasi-2D perovskites. The device results reveal that the maximum external quantum efficiency （EQE） of PFPO-treated perovskite LEDs has increased from 1.83% to 3.62%. The emission peak is located at 466 nm， corresponding to CIE of （0.123， 0.079）， which is close to the International Telecommunication Union （ITU） Rec. 2020 blue standard （0.131， 0.046）.

Key words: Perovskite, Phosphine oxide additive, Blue light emitting diodes

CLC Number:

O649.4

Run ZHANG, Hong-Mei ZHAN, Chen-Yang ZHAO, Yan-Xiang CHENG, Chuan-Jiang QIN. Pure Blue Perovskite Light‑Emitting Diodes Modified with Fluorine‑Containing Phosphine Oxide Derivatives[J]. Chinese Journal of Applied Chemistry, 2024, 41(6): 830-838.

Figures/Tables 7

Fig.1 （A） Electronegativity data of PFPO and DPPO additives calculated by DFT；（B） FT-IR spectra of pure DPPO and DPPO with PbBr2；（C） FT-IR spectra of pure PFPO and PFPO with PbBr2；（D） XPS spectra of Pb4f for control and DPPO-treated perovskite films；（E） XPS spectra of Pb4f for control and PFPO-treated perovskite films

Fig.2 1H NMR spectra of （A） DPPO， PEABr， DPPO with PEABr （molar ratio=1∶1）；（B） PFPO， PEABr， PFPO with PEABr （molar ratio=1∶1）；（C） 19F NMR spectra of PFPO， PFPO with PEABr

Fig.3 （A） UV?Vis absorbance，（B） PL and （C） TRPL spectra of perovskite films with and without additives

Fig.4 （A） XRD patterns of different perovskite films； SEM images for control （B）， DPPO-treated （C） and PFPO-treated （D） films

Table 1 Atomic mass percentage ratios at different site in the film

Site	w（Br）/%	w（Cl）/%	w（Pb）/%
Site1	11.60	1.24	14.95
Site2	4.81	0.58	4.36

Fig.5 Current density-voltage characteristic curves of ITO/PEDOT∶PSS/perovskite/MoO3/LiF/Al devices

Fig.6 （A） Device structure of PeLEDs；（B） Maximum external quantum efficiency-current density curves；（C） current density-voltage-luminance curves for control and modified PeLEDs；（D-F） EL spectra of different devices

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Pure Blue Perovskite Light‑Emitting Diodes Modified with Fluorine‑Containing Phosphine Oxide Derivatives

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