title: Electrically Driven White Light Emission from Intrinsic Metal-Organic Framework.
abstract: Light-emitting diodes (LEDs) have drawn tremendous potential as a replacement of traditional lighting due to its low-power consumption and longer lifetime. Nowadays, the practical white LEDs (WLED) are contingent on the photon down-conversion of phosphors containing rare-earth elements, which limits its utility, energy, and cost efficiency. In order to resolve the energy crisis and to address the environmental concerns, designing a direct WLED is highly desirable and remains a challenging issue. To circumvent the existing difficulties, in this report, we have designed and demonstrated a direct WLED consisting of a strontium-based metal-organic framework (MOF), {[Sr(ntca)(H2O)2]·H2O}n (1), graphene, and inorganic semiconductors, which can generate a bright white light emission. In addition to the suitable design of a MOF structure, the demonstration of electrically driven white light emission based on a MOF is made possible by the combination of several factors including the unique properties of graphene and the appropriate band alignment between the MOF and semiconductor layer. Because electroluminescence using a MOF as an active material is very rare and intriguing and a direct WLED is also not commonly seen, our work here therefore represents a major discovery which should be very useful and timely for the development of solid-state lighting.
authors: Department of Engineering and System Science, National Tsing Hua University , Hsinchu 300, Taiwan, Republic of China.|Nano-Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Tsing Hua University , Taipei 115, Taiwan, Republic of China.|Department of Physics, National Taiwan University , Taipei 106, Taiwan, Republic of China.
authors: Golam
authors: G
authors: Haider
authors: Institute of Chemistry, Academia Sinica , Taipei 115, Taiwan, Republic of China.
authors: Muhammad
authors: M
authors: Usman
authors: Department of Physics, National Taiwan University , Taipei 106, Taiwan, Republic of China.
authors: Tzu-Pei
authors: TP
authors: Chen
authors: Department of Physics, National Taiwan University , Taipei 106, Taiwan, Republic of China.
authors: Packiyaraj
authors: P
authors: Perumal
authors: Institute of Chemistry, Academia Sinica , Taipei 115, Taiwan, Republic of China.
authors: Kuang-Lieh
authors: KL
authors: Lu
authors: Department of Physics, National Taiwan University , Taipei 106, Taiwan, Republic of China.
authors: Yang-Fang
authors: YF
authors: Chen
keywords: electroluminescence; graphene; light-emitting diode; metal−organic frameworks; natural white light; photoluminescence