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. 2024 Jun 10;14(26):18567-18575.
doi: 10.1039/d4ra02652g. eCollection 2024 Jun 6.

Post-hot-cast annealing deposition of perovskite films with infused multifunctional organic molecules to enhance the performance of large-area light-emitting devices

Ching-Ho Tien  1   2 , Jun-Qing Liu  3 , Lung-Chien Chen  3
Affiliations

Post-hot-cast annealing deposition of perovskite films with infused multifunctional organic molecules to enhance the performance of large-area light-emitting devices

Ching-Ho Tien et al. RSC Adv. .

Abstract

All-inorganic perovskites show great promise as an emission layer in perovskite light-emitting diodes (PeLEDs) owing to their easy solution processing, low manufacturing cost, and excellent optoelectronic properties. However, there is still an immense performance gap from small-area devices to large-area PeLED devices. The inhomogeneity of large-area high-quality perovskite films inevitably leads to vast defects and electroluminescence performance losses. Herein, a post-hot-cast annealing deposition scheme and the introduction of the multifunctional molecule 2-amino-1,3-propanediol (APDO) were proposed to regulate the crystallization of the perovskite film. As a result, uniform APDO:CsPbBr2.5Cl0.5 perovskite films with high crystallinity and lower defect density were deposited by post-hot-cast annealing. A decent maximum brightness of 2659 cd m-2 was achieved for the large-area cyan PeLEDs with an emitting area of 400 mm2.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1. (a) Schematic of the synthesis route for APDO:CsPbBr2.5Cl0.5 perovskite films. (b) Schematic device structure of PeCLED and luminescence photo.
Fig. 2
Fig. 2. (a) Photoluminescence (PL), and (b) time-resolved PL spectra of the CsPbBr2.5Cl0.5 perovskite films with different preparation methods and different APDO doping contents.
Fig. 3
Fig. 3. Absorption spectra of CsPbBr2.5Cl0.5 perovskite films with different preparation methods and different APDO doping contents.
Fig. 4
Fig. 4. XRD patterns of CsPbBr2.5Cl0.5 perovskite films with different preparation methods and APDO doping contents.
Fig. 5
Fig. 5. Surface SEM images of CsPbBr2.5Cl0.5 perovskite films with different preparation methods and APDO doping contents.
Fig. 6
Fig. 6. AFM images of CsPbBr2.5Cl0.5 perovskite films with different preparation methods and APDO doping contents.
Fig. 7
Fig. 7. Characteristics of large-area PeLEDs with different preparation methods and APDO doping contents. (a) J–V, (b) L–V, (c) CE–V, (d) EQE–V, (e) EL spectra, and (f) operating lifetime test ((inset) photographs of the working SC- and HC-2mg APDO PeLEDs).
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