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1 August 2021 Stable all‐inorganic perovskite quantum dots using a ZnX2‐trioctylphosphine‐oxide and a new hole transporting polymer in PeLEDs
Sangshin Park, Hyukmin Kwon, Seokwoo Kang, Sunwoo Park, Jongwook Park
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Proceedings Volume 11808, Organic and Hybrid Light Emitting Materials and Devices XXV; 118081F (2021) https://doi.org/10.1117/12.2593786
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Highly stable perovskite quantum dots (PeQDs) are developed using excess Zn precursor and trioctylphosphine‐oxide (TOPO). They not only have high quantum efficiency and sharp full width at half maximum values (15–30 nm) but also have improved long‐term stability at high temperature. They have EQE (%) and current efficiency (Cd A−1) of (7.12%, 9.93 Cd A−1) for red, (6.06%, 32.5 Cd A−1) for green, and (0.56%, 0.88 Cd A−1) for blue‐emitting devices, respectively. Also, a new hole-transporting material, poly-2-(9Hcarbazol-9-yl)-5-(4-vinylphenyl)-5H-benzo[b]carbazole (PBCZCZ), was developed for perovskite light-emitting diodes (PeLEDs). The EQE of the green PeLEDs using PBCZCZ was about 2.5 times higher and that of the sky-blue PeLEDs was about 3 times higher than the device made with the commercial HTL of PVK. The operational device lifetimes of the green and sky-blue PeLEDs made with PBCZCZ were about 4.1 and 4.8 times higher than the PVK-containing device.
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Sangshin Park, Hyukmin Kwon, Seokwoo Kang, Sunwoo Park, and Jongwook Park "Stable all‐inorganic perovskite quantum dots using a ZnX2‐trioctylphosphine‐oxide and a new hole transporting polymer in PeLEDs", Proc. SPIE 11808, Organic and Hybrid Light Emitting Materials and Devices XXV, 118081F (1 August 2021); https://doi.org/10.1117/12.2593786
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KEYWORDS
Perovskite
Cadmium
Light emitting diodes
Polymers
Electroluminescence
External quantum efficiency
Quantum dots
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