Alkynyl Au (III) coordination compound and light-emitting device

Abstract

The present invention provides an alkynyl Au (III) coordination compound, which has a structure represented by a formula I, wherein in the formula I, R<1>-R<17> are defined in the specification. The alkynyl Au (III) coordination compound provided by the invention has excellent luminescence properties such as short luminescence life, high external quantum efficiency, low efficiency roll-off reduction in actual high-brightness use and the like, and is the best result obtained in current gold (III) coordination compound, especially alkynyl Au (III) coordination compound research. The invention further provides a light-emitting device.

Description

technical field [0001] The invention belongs to the technical field of coordination chemistry and luminescent materials, and in particular relates to a gold (III) complex and a luminescent device. Background technique [0002] Organic electroluminescent diode (OLED) is a new generation of display and lighting technology. The key to its performance lies in the light-emitting materials used. At present, the research on light-emitting materials mainly focuses on Pt(II), Ir(III) or Ru(II) In the field of complexes, some complexes have been commercialized as light-emitting materials and applied to flat panel displays of electronic products. It is of great significance to pursue the development of luminescent materials based on a wider range of metal complexes, especially based on cheaper metal complexes. [0003] The luminescence of luminescent materials is mainly based on phosphorescence luminescence and fluorescence luminescence. In metal complexes, the electronic part that is...

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Problems solved by technology

However, since the energy level of the T1 state is often lower than that of the S1 state, the proportion of anti-intersystem crossing from the T1 state is often low. However, when the energy gap between the S1 state and the T1 state (ΔE ST )) narrow enough (-1 ), and the T1 state has a low radiation decay rate, the proportion of RISC at room temperature can be greatly increased [Chem.Soc.Rev.2017,46,915]

[0005] In the existing literature, the use of gold (III) complexes as luminescent materials has received more attention since it was reported. Among them, the multidentate coordination complexes of alkyne gold (III) obtained better results and were prepared by solution method. The maximum external quantum efficiency EQE value obtained by the relevant alkyne base (III) complex is 15.3%, and the best EQE obtained by the device containing the alkyne base (III) complex prepared by vacuum evaporation method is 20.3 at low luminance %, however, is limited by the efficiency roll-off, that is, as the brightness increases, the EQE drops sharply. When the luminous brightness is 1000 candela / square meter (cd / A), the EQE drops (efficiency roll-off) by 90%, Due to the low quantum efficiency and serious self-quenching, it is difficult to use high doping concentration, and there is still a gap from commercial application

Studies have shown that it has triplet-based intraligand or ligand-ligand charge transfer and photophosphorescence of excimates through π–π stacking of C^N^C ligands. Further studies have shown that due to the Spin-forbidden radiative decay from the T1 state to the S0 state, the triplet excited state T1 of this alkyne-like fund(III) complex shows a lower radiative decay rate, about 10 2 –10 3 the s -1 , which is not conducive to obtaining higher quantum efficiency, making it difficult for the existing alkyne-based (III) complexes to meet the requirements for the light-emitting materials of the commercialized OLED highlight display, and the slow light-emitting mechanism of the light-emitting materials leads to its relatively low efficiency. Difficult to be used in OLEDs as the main disadvantages and limitations of light emitters, therefore, there is a long way to go to develop new OLED light emitting materials that use gold (III) complexes as cheap alternatives

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