High Performance Blue Perovskite Light Emitting Diode Realized by Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) Modification

doi:10.6023/A23070344

Abstract

Metal halide perovskite materials, with their high stability and excellent optical properties, have attracted considerable attention and research in the field of optoelectronic devices. Especially in recent years, the research of green and red perovskite light-emitting diodes (PeLEDs) has made remarkable progress. However, the development of blue PeLEDs has lagged behind that of green and red PeLEDs, and is much less efficient, limiting the applications of perovskite light-emitting devices in color displays and solid-state lighting. One of the main reasons is the mismatch between the energy levels of the hole transporting layer and the blue perovskite material. In this study, we inhibited the non-radiative recombination between the interface of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) and perovskite materials by first modifying the hole transporting layer material PEDOT:PSS with poly(sodium 4-styrenesulfonate) (PSS-Na) and potassium bromide (KBr). The quality of the perovskite layer film was improved by optimizing the fabrication process to reduce the roughness of the hole transporting layer film. Finally, perovskite light emitting devices are fabricated by vacuum evaporation. It is shown that the use of PSS-Na and KBr can effectively increase the hole transporting capacity and thus improve the overall performance of the PeLEDs device. Moreover, the blue PeLEDs prepared by PEDOT:PSS modified by PSS-Na alone have low on-voltage (only 3.3 V) and high external quantum efficiency (EQE) (up to 4.12%). With the further addition of KBr to the modified PEDOT:PSS of PSS-Na, the maximum EQE of the final blue PeLEDs reaches 6.25%, the on-chip voltage drops to 3 V, and the peak wavelength is 488 nm, which is a blue sky perovskite light emitting device. In addition, compared to other blue-emitting perovskite devices, this device also exhibits excellent spectral stability at different voltages. The efficiency and stability of perovskite light-emitting devices can be improved by modifying the hole transporting layer, showing the potential of perovskite light-emitting diodes for color displays and solid-state lighting.

Key words: perovskite material, blue PeLEDs, hole transporting layer, modification

Cite this article

Xuan Zhang, Jun Xiong, Wang Zhang. High Performance Blue Perovskite Light Emitting Diode Realized by Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) Modification[J]. Acta Chimica Sinica, 2023, 81(12): 1695-1700.

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Fig. & Tab. 8

Figure 1. (a) XRD of perovskite thin film on different HTLs; (b) UV-vis absorption spectra; (c) PL and photograph under 365 nm excitation; (d) TRPL spectra of the perovskites based on PEDOT:PSS, m-PEDOT:PSS and m-PEDOT:PSS＋KBr films

Figure 2. AFM images of (a) PEDOT:PSS, (b) m-PEDOT:PSS, (c) m-PEDOT:PSS＋KBr, (d) PEDOT:PSS/PVSK, (e) m-PEDOT:PSS/ PVSK and (f) m-PEDOT:PSS＋KBr/PVSK

Figure 3. SEM images of (a) PEDOT:PSS, (b) m-PEDOT:PSS, (c) m-PEDOT:PSS＋KBr, (d) PEDOT:PSS/PVSK, (e) m-PEDOT:PSS/ PVSK and (f) m-PEDOT:PSS＋KBr/PVSK

Figure 4. XPS spectra of different HTLs. (a) XPS survey spectra of the HTLs; (b) the K 2p core-level energy spectra; (c) the Na 1s core-level energy spectra; (d) the S 2p core-level energy spectra

Figure 5. (a) UPS spectra of samples; (b) energy levels for ITO, PEDOT:PSS, m-PEDOT:PSS, m-PEDOT:PSS＋KBr and perovskite

Figure 6. Performance diagram of PeLED device with different HTLs. (a) Voltage-current density (V-J) curve; (b) luminance-voltage curve (L-V); (c) voltage-current efficiency (V-CE) curve; (d) voltage-external quantum efficiency (V-EQE) curve

HTL层材料	V_on/V	L_max/(cd•m⁻²)	EQE_max/%	CE_max/(cd•A⁻¹)
PEDOT:PSS	4.1	1843	0.86	1.30
m-PEDOT:PSS	3.3	1930	4.14	8.62
m-PEDOT:PSS＋KBr	3	2322	6.25	12.56

Table 1. Device performances of PeLEDs with PEDOT:PSS, m-PEDOT:PSS and m-PEDOT:PSS＋KBr

Figure 7. (a) EL spectra of PEDOT:PSS, m-PEDOT:PSS and m-PEDOT:PSS＋KBr sky blue PeLEDs; (b) EL spectra of PEDOT:PSS PeLED at different voltage; (c) EL spectra of m-PEDOT:PSS PeLED at different voltage; (d) EL spectra of m-PEDOT:PSS＋KBr PeLED at different voltage

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通过聚(3,4-乙烯二氧噻吩)-聚苯乙烯磺酸改性实现高性能蓝色钙钛矿发光二极管