Chen Jiale, Li Jiaxiong, Nedelcu Georgian, Hansch Paul, Di Mario Lorenzo, Protesescu Loredana, Loi Maria A
Photophysics & OptoElectronics, Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 3 9747AG Groningen The Netherlands
Materials Chemistry, Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 3 9747AG Groningen The Netherlands.
J Mater Chem C Mater. 2024 Jul 31;12(35):13847-13853. doi: 10.1039/d4tc02404d. eCollection 2024 Sep 12.
Colloidal perovskite nanoplatelets (NPLs) have shown promise in tackling blue light-emitting diode challenges based on their tunable band gap and high photoluminescence efficiencies. However, high quality and large area dense NPL films have been proven to be very hard to prepare because of their chemical and physical fragility during the liquid phase deposition. Herein, we report a perovskite-polymer composite film deposition strategy with fine morphology engineering obtained using the blade coating method. The effects of the polymer type, solution concentration, compounding ratio and film thickness on the film quality are systematically investigated. We found that a relatively high-concentration suspension with an optimized NPL to polymer ratio of 1 : 2 is crucial for the suppression of phase separation and arriving at a uniform film. Finally, sky-blue NPL-based perovskite light-emitting diodes were fabricated by blade coating showing an EQE of 0.12% on a device area of 16 mm.
胶体钙钛矿纳米片（NPLs）因其可调谐带隙和高光致发光效率，在解决蓝光发光二极管挑战方面展现出了潜力。然而，由于在液相沉积过程中其化学和物理脆弱性，高质量、大面积致密的NPL薄膜已被证明很难制备。在此，我们报告了一种采用刮涂法获得的具有精细形貌工程的钙钛矿-聚合物复合薄膜沉积策略。系统研究了聚合物类型、溶液浓度、复合比例和薄膜厚度对薄膜质量的影响。我们发现，具有优化的NPL与聚合物比例为1:2的相对高浓度悬浮液对于抑制相分离和获得均匀薄膜至关重要。最后，通过刮涂法制备了基于天蓝色NPL的钙钛矿发光二极管，在16平方毫米的器件面积上显示出0.12%的外量子效率。
