Efficient and tunable white-light emission of metal–organic frameworks by iridium-complex encapsulation

Abstract

Metal–organic frameworks (MOFs) are well known for their tunable structure and porosity. Many studies have shown they are promising for various important applications, for which their performance can be further enhanced by encapsulating functional species, such as luminescent guest molecules, within the frameworks. Although numerous MOFs are luminescent, very few emit white light and their quantum yield is usually low. Here we report a strategy to achieve efficient white-light emission by encapsulating an iridium complex in the MOF cavity. A mesoporous blue-emitting MOF is prepared as host to encapsulate a yellow-emitting iridium complex, [Ir(ppy)2(bpy)]+. The resultant composites emit bright white light with good colour quality (for example, Commission International de I’Eclairage coordinates, colour-rendering index and correlated colour temperature of (0.31, 0.33), 84.5 and 5409 K, respectively), and high quantum yield up to 115 °C. This strategy may open new perspectives for developing high-performance energy-saving solid-state lighting materials.

Homochiral Emissive Λ8‐ and Δ8‐[Ir8Pd4]16+ Supramolecular Cages

“…Importantly, by modulating the degree of energy transfer between the donor and the acceptor as a function of the choice of medium or concentration, emission of white light can also be achieved 21a, 35. In the context of iridium phosphors, this approach has been investigated in multi‐metallic covalently linked complexes,36 soft salts,21a or in MOFs containing emissive materials,19d but still remains unexplored in photo‐active host–guest assemblies 35…”

Pure white-light emitting ultrasmall organic–inorganic hybrid perovskite nanoclusters

“…(2) Inorganic phosphors require metal ion doping in order to achieve white-light emission. 55,56 (3) Whitelight emitting multi-layer films can be prepared by mixing various color-emitting QDs but the devices suffer significant deficiency due to the self-absorption process that arises from different sized nanoclusters. Our organic-inorganic hybrid PNCs obviate all these drawbacks.…”

SCOPE OF VARIOUS SOLVENTS AND THEIR EFFECTS ON SOLVOTHERMAL SYNTHESIS OF Ni-BTC

“…[7][8][9][10] Due to their modular nature and structural tunability, application of MOFs has been widening in the fields of light harvesting, [11][12][13][14][15] sensing, 16 optical luminescence, 17,18 ionic conductivity, [19][20][21] nonlinear optical behavior 22 and as precursors for the synthesis of nanomaterials with interesting properties. [23][24][25][26][27][28][29] A huge variety of MOFs have been synthesized and reported so far with synthesis techniques such as hydrothermal, solvothermal, microwave assisted heating, mechanochemical, electrochemical and, more recently, ultrasonic processes.…”