期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201707006
关键词
2D-Ruddlesden-Popper perovskites; amplified spontaneous emission; energy cascades; energy transfer; quantum-wells
类别
资金
- Ministry of Science and Technology of China [2017YFA0204503]
- High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [CITTCD20180331, IDHT20180517]
- Beijing Natural Science Foundation of China [2162011]
- National Natural Science Foundation of China [21521062, 21503139, 21673144]
- Youth Innovative Research Team of Capital Normal University
2D Ruddlesden-Popper perovskites (RPPs) are a class of quantum-well (QW) materials, composed of layered perovskite QWs encapsulated between two hydrophobic organic layers. Different from widely investigated 3D-perovskites with free carriers at room temperature, 2D-RPPs exhibit strongly bound electron-hole pairs (excitons) for high-performance solar cells and light emitting diodes (LEDs). Herein, it is reported that self-organized multiple QWs in 2D-RPP thin films naturally form an energy cascade, which enables an ultrafast energy transfer process from higher energy-bandgap QWs to lower energy-bandgap QWs. Therefore, photoexcitations are concentrated on lower-bandgap QWs, facilitating the build-up of population inversion. Room-temperature amplified spontaneous emission (ASE) from 2D-RPP thin films is achieved at dramatically low thresholds, with gain coefficients as high as >300 cm(-1), and stoichiometrically tunable ASE wavelengths from visible to near-infrared spectral range (530-810 nm). In view of the high efficiency reported for LEDs, these solution-processed 2D-RPP thin films may hold the key to realize electrically driven lasers.
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