Electrically driven white light emission from intrinsic metal–organic framework

G Haider, M Usman, TP Chen, P Perumal, KL Lu… - ACS …, 2016 - ACS Publications
G Haider, M Usman, TP Chen, P Perumal, KL Lu, YF Chen
ACS nano, 2016ACS Publications
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 …
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.
ACS Publications
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