High Performance Blue Perovskite Light Emitting Diode Realized by Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) Modification
Received date: 2023-07-18
Online published: 2023-10-08
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
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 . DOI: 10.6023/A23070344
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