4.8 Article

Construction of Robust Cadmium-Free Cu-In-Zn-S Nanocrystals and Polyfluorene Derivatives Hybrid Emissive Layer for Stable Electroluminescent White Light-Emitting Devices

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 30, 页码 7113-7119

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c02060

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资金

  1. National Natural Science Foundation of China [61974009, 61735004, 22075136, 61874053]
  2. Jiangsu Postgraduate Innovation Program [KYCX21_1097]

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The combination of inorganic nanocrystals and solution-processed conjugated polymer is an effective strategy to achieve stable and efficient white-light-emitting diodes. By optimizing the device with a new polymer, the maximum external quantum efficiency was increased by 221% while maintaining stable spectrum under high voltage, providing a great foundation for cadmium-free white-light LEDs.
Combination of the merit of inorganic nanocrystals (NCs) and solution-processed conjugated polymer is a convenient strategy to obtain stable and efficient electroluminescent white-light-emitting diodes (el-WLEDs). In this work, an el-WLED was fabricated on the basis of Cd-free Cu-In-Zn-S (CIZS)/ZnS NCs blending with polyfluorene derivative poly[4-(octyloxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(octyloxy)-9,9-diphenylfluoren-2,7-diyl] (PODPF), which exhibited a stable white light emission with a color rendering index value of 85. Meanwhile, it had a stable spectrum under high voltage due to the extremely weak energy transfer between PODPF and CIZS/ZnS NCs. To further improve the device performance, PC9O4 was used to replace PODPF, which presented better solubility and smoother film-forming properties. Thus, the maximum external quantum efficiency (EQE) of the optimized el-WLED was increased by 221% while maintaining a stable spectrum under high voltage. This work may provide a great foundation on color mixing cadmium-free el-WLEDs.

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