TY - JOUR
T1 - Highly flexible and stable green perovskite light-emitting diodes based on IL-modified PEDOT:PSS film
AU - Han, Ji Ho
AU - Sadhukhan, Priyabrata
AU - Myoung, Jae Min
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/12/30
Y1 - 2023/12/30
N2 - Flexible light-emitting diodes (LEDs) are highly sought-after for various applications, such as wearable medical devices, decorative lighting, and flexible displays. Perovskite-based LEDs, due to their low cost, ease of fabrication, and high color purity, have attracted significant attention as promising candidates for modern display technology. However, a primary challenge remains in selecting a bottom anode that provides both high electrical conductivity and optical transmittance while maintaining mechanical robustness to endure rigorous bending. To address this issue, a highly flexible and stable ionic liquid (IL)-modified poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS) bottom anode was developed for high-performance flexible perovskite LEDs (PeLEDs). The addition of 1-ethyl-3-methylimidazolium tetracyanoborate (EMIM TCB) IL initiates a depth-dependent rearrangement of the PEDOT and PSS moieties within the PEDOT:PSS film and improves its conductivity by orders of magnitude. Additionally, the IL increases the work function of the PEDOT:PSS layer, leading to a reduced barrier for hole injection. The fabricated flexible green PeLEDs exhibited pure green emission at 520 nm with a maximum external quantum efficiency (EQE) of 11.6% and maximum luminance of 25566.8 cd/m2. Remarkably, the device retained 85% of its initial luminance after 5000 bending cycles at a 5 mm bending radius.
AB - Flexible light-emitting diodes (LEDs) are highly sought-after for various applications, such as wearable medical devices, decorative lighting, and flexible displays. Perovskite-based LEDs, due to their low cost, ease of fabrication, and high color purity, have attracted significant attention as promising candidates for modern display technology. However, a primary challenge remains in selecting a bottom anode that provides both high electrical conductivity and optical transmittance while maintaining mechanical robustness to endure rigorous bending. To address this issue, a highly flexible and stable ionic liquid (IL)-modified poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS) bottom anode was developed for high-performance flexible perovskite LEDs (PeLEDs). The addition of 1-ethyl-3-methylimidazolium tetracyanoborate (EMIM TCB) IL initiates a depth-dependent rearrangement of the PEDOT and PSS moieties within the PEDOT:PSS film and improves its conductivity by orders of magnitude. Additionally, the IL increases the work function of the PEDOT:PSS layer, leading to a reduced barrier for hole injection. The fabricated flexible green PeLEDs exhibited pure green emission at 520 nm with a maximum external quantum efficiency (EQE) of 11.6% and maximum luminance of 25566.8 cd/m2. Remarkably, the device retained 85% of its initial luminance after 5000 bending cycles at a 5 mm bending radius.
KW - 1-Ethyl-3-methylimidazolium tetracyanoborate (EMIM TCB)
KW - Flexible film
KW - Flexible light-emitting diodes
KW - Ionic liquids
KW - Perovskites
KW - Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS)
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U2 - 10.1016/j.apsusc.2023.158493
DO - 10.1016/j.apsusc.2023.158493
M3 - Article
AN - SCOPUS:85171876525
SN - 0169-4332
VL - 641
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 158493
ER -