Photofunctional Rare Earth Hybrid Materials Based on Functionalized Microporous Zeolites

Yan, Bing

doi:10.1007/978-981-10-2957-8_4

Cited by 1 publication

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“…These drawbacks further restrict the use of lanthanide complexes in technological applications. However, this can be overcome by embedding the lanthanide complexes in matrices such as sol–gel silica, zeolites, mesoporous materials, or polymers , forming the so-called “organic–inorganic hybrid materials”. Among these materials, polymers are ideal candidates as a matrix for lanthanide complexes because of their attractive properties such as ease of processing, flexibility, and, more importantly, ability to provide mechanical strength to the hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Ternary Europium Complex for Organic Electroluminescent Devices and as a Sensitizer to Improve Electroluminescence of Red-Emitting Iridium Complex

Ilmi

Khan

et al. 2019

Inorg. Chem.

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Two new lanthanide complexes [Ln(hfaa)3(Py-Im)] [hfaa = hexafluoroacetylacetone, Py-Im = 2-(2-pyridyl)benzimidazole and Ln = Eu(III) (1) and Tb(III) (2)] were synthesized and characterized. An X-ray crystal structure determination confirms that complex 1 is eight-coordinate with a distorted trigonal dodecahedral geometry. It shows typical vivid red Eu(III) emission in the solid state, in solution, and in a polymer matrix. The observed lifetime (τobs) of complex 1 in the solid state, in dichloromethane (DCM) solution, and in thin films is 833.01, 837.95, and 626.16–715.69 μs, respectively, with a photoluminescence quantum yield Q Eu L ≈ 33% in DCM solution. Complex 2 displays a yellowish-green emission in the solid state (τobs ≈ 36.99 μs), while a near white-light emission in solution (x; 0.2574: y; 0.3371) and in thin films. Therefore, it is a potential candidate for generating single-component white light-emitting materials for solid-state lighting applications. The kinetic scheme for modeling energy-transfer processes shows that the main donor state for 1 is the ligand triplet state (T1) and that energy transfer occurs to both the 5D1 (56.55%) and 5D0 (40.58%) levels. We fabricated a series of single- and double-layer organic light-emitting devices using complex 1. The luminance of the optimized double-layer electroluminescence (EL) device was 373 cd/m2 with very low turn-on voltage of ∼4.2 V. Complex 1 was further utilized as a sensitizer to improve the EL of a red-emitting iridium complex PQ2Ir(dpm) (PQ = phenylquinoly-N,C2′, dpm = dipivaloylmethane). The codoped device achieved a maximum brightness and maximum current efficiency (ηc) of 93 224 cd/m2 and 36.38 cd/A, respectively.

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