Sanchez Rafael S, de la Fuente Mauricio Solis, Suarez Isaac, Muñoz-Matutano Guillermo, Martinez-Pastor Juan P, Mora-Sero Ivan
Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain.
UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, 46071 Valencia, Spain.
Sci Adv. 2016 Jan 22;2(1):e1501104. doi: 10.1126/sciadv.1501104. eCollection 2016 Jan.
We report the first observation of exciplex state electroluminescence due to carrier injection between the hybrid lead halide perovskite (MAPbI3-xClx) and quantum dots (core/shell PbS/CdS). Single layers of perovskite (PS) and quantum dots (QDs) have been produced by solution processing methods, and their photoluminescent properties are compared to those of bilayer samples in both PS/QD and QD/PS configurations. Exciplex emission at lower energies than the band gap of both PS and QD has been detected. The exciplex emission wavelength of this mixed system can be simply tuned by controlling the QD size. Light-emitting diodes (LEDs) have been fabricated using those configurations, which provide light emission with considerably low turn-on potential. The "color" of the LED can also be tuned by controlling the applied bias. The presence of the exciplex state PS and QDs opens up a broad range of possibilities with important implications not only in tunable LEDs but also in the preparation of intermediate band gap photovoltaic devices with the potentiality of surpassing the Shockley-Queisser limit.
我们报道了关于混合卤化铅钙钛矿（MAPbI3-xClx）与量子点（核/壳PbS/CdS）之间载流子注入导致的激基复合物态电致发光的首次观察结果。通过溶液处理方法制备了单层钙钛矿（PS）和量子点（QDs），并将它们的光致发光特性与PS/QD和QD/PS构型的双层样品进行了比较。检测到了能量低于PS和QD带隙的激基复合物发射。通过控制量子点尺寸可以简单地调节这种混合系统的激基复合物发射波长。利用这些构型制造了发光二极管（LED），其提供了具有相当低开启电位的发光。LED的“颜色”也可以通过控制施加的偏压来调节。激基复合物态PS和QDs的存在不仅为可调谐LED，而且为制备具有超越肖克利-奎塞尔极限潜力的中间带隙光伏器件开辟了广泛的可能性。
