Duan Yanyan, Yin Guang-Zhong, Wang De-Yi, Costa Rubén D
IMDEA Materials Institute, Calle Eric Kandel 2, Getafe 28906, Spain.
Departamento de Ciencia de Materiales, Universidad Politécnica de Madrid, E.T.S. de Ingenieros de Caminos, Profesor Aranguren s/n, Madrid 28040, Spain.
ACS Appl Mater Interfaces. 2021 May 12;13(18):21800-21809. doi: 10.1021/acsami.1c04025. Epub 2021 Apr 28.
Metal halide perovskite (MHP)-based phosphor-converted light-emitting diodes (pc-LEDs) are limited by the low MHP stability under storage/operation conditions. A few works have recently established the in situ synthesis of MHPs into polymer matrices as an effective strategy to enhance the stability of MHP with a low-cost fabrication. However, this is limited to petrochemical-based polymers. Herein, the first in situ ambient preparation of highly luminescent and stable MHP-biopolymer filters (MAPbBr nanocrystals as an emitter and poly(l-lactic acid) (PLLA) as the matrix) with arbitrary areas (up to ca. 300 cm) is reported. The MAPbBr-PLLA phosphors feature a narrow emission (25 nm) with excellent photoluminescence quantum yields (>85%) and stability under ambient storage, water, and thermal stress. This is corroborated in green pc-LEDs featuring a low-efficiency roll-off, an excellent operational stability of ca. 600 h, and high luminous efficiencies of 65 lm W that stand out compared to the prior state of the art (e.g., an average lifetime of 200 h at 50 lm W). The filters are further exploited to fabricate white-emitting pc-LEDs with efficiencies of ca. 73 lm W and / CIE color coordinates of 0.33/0.32. Overall, this work establishes a straightforward (one-pot/in situ) and low-cost preparation (ambient/room temperature) of highly efficient and stable MHP-biopolymer phosphors for highly performing and more sustainable lighting devices.
基于金属卤化物钙钛矿（MHP）的荧光粉转换发光二极管（pc-LED）受到存储/运行条件下MHP稳定性低的限制。最近有一些研究将MHP原位合成到聚合物基质中，作为一种通过低成本制造来提高MHP稳定性的有效策略。然而，这仅限于石化基聚合物。在此，报道了首次在环境条件下原位制备具有任意面积（最大约300平方厘米）的高发光且稳定的MHP生物聚合物滤光片（以MAPbBr纳米晶体作为发光体，聚（L-乳酸）（PLLA）作为基质）。MAPbBr-PLLA荧光粉具有窄发射（25纳米），在环境存储、水和热应力下具有优异的光致发光量子产率（>85%）和稳定性。这在绿色pc-LED中得到了证实，其具有低效率滚降、约600小时的优异运行稳定性以及65流明/瓦的高发光效率，与现有技术水平相比表现突出（例如，在50流明/瓦时平均寿命为200小时）。这些滤光片还被用于制造效率约为73流明/瓦、色坐标为0.33/0.32的发白光pc-LED。总体而言，这项工作建立了一种直接（一锅法/原位）且低成本的制备方法（环境/室温），用于制备高效且稳定的MHP生物聚合物荧光粉，以用于高性能和更可持续的照明设备。
