Achiral polymer-based organic electroluminescent circularly polarized light-emitting device

A light-emitting device, circularly polarized light technology, applied in the direction of electric solid device, electrical components, organic chemistry, etc., can solve the problem of affecting the uniformity of the active layer and affecting the performance of the emitter.

Pending Publication Date: 2021-07-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Nevertheless, these methods have some limitations, the former usually requires extensive custom material synthesis and complex device optimization work, while the introduction of chiral additives in the latter usually affects the uniformity of the active layer and affects the performance of the emitter
Using the intrinsic properties of electroluminescent materials to directly achieve circularly polarized electroluminescence without chiral additives is a simple and effective approach, but there are also great challenges

Method used

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  • Achiral polymer-based organic electroluminescent circularly polarized light-emitting device
  • Achiral polymer-based organic electroluminescent circularly polarized light-emitting device
  • Achiral polymer-based organic electroluminescent circularly polarized light-emitting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The synthetic method of organoboride monomer I is

[0060] In the glove box, 9,9-dihexyl-2,7-dibromofluorene (2.03mmol, 1.00g) was added to the reaction eggplant bottle, and refined tetrahydrofuran (THF, 40mL) was added, and after sealing, it was taken out and inert gas ( Nitrogen, N2) protection, and then placed in a low-temperature thermostat at -78°C to keep the temperature; then, a n-butyllithium / n-hexane solution (n-BuLi, 6.09mmol, 2.4M, 2.54mL) was added dropwise with a disposable syringe, After the dropwise addition, continue stirring at constant temperature for 1 hour; then use a disposable syringe to inject 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborane (6.09 mmol, 1.13g, 1.24mL), and stirred at constant temperature for 1 hour; then the whole reaction eggplant bottle was taken out from the low-temperature constant temperature tank, and the temperature was naturally raised, and the reaction was stirred at room temperature overnight; a small amount of deioniz...

Embodiment 2

[0066] figure 1 is the surface topography of the film prepared by using F6BT, such as figure 1 As shown, the atomic force microscope characterization results show that: different concentrations (5, 10, 15 mg·mL -1 ) F6BT / toluene solution can be spin-coated (3000rpm) respectively to obtain thin films with different thicknesses (25, 65, 95nm) but with smooth, flat, dense and uniform surfaces. (ΔRq<0.25nm), indicating that F6BT has excellent film-forming properties.

[0067] The normalized UV-visible absorption spectrum (Normalized Abs) and normalized photoluminescence spectrum (Normalized PL) of F6BT are as follows figure 2 shown; where curve 1 represents the absorption spectrum, and curve 2 represents the fluorescence spectrum; it can be seen from the figure that the absorption spectrum (Abs) of F6BT almost covers the entire band from the near ultraviolet region of ultraviolet to the blue-violet region of visible light; the spectrum presents obvious double The peak shape an...

Embodiment 4

[0073] Example 4 The circular dichroism endowed by circularly polarized light to F6BT is not only related to the left-handed direction of the induced circularly polarized light, but also related to its wavelength

[0074] Under the induction of left-handed circularly polarized light, if the wavelength of the induced light is 450nm, as mentioned above, the induced sample will show a positive Codon effect, but if the wavelength of the induced light is adjusted to 532nm, as Figure 7 As shown, it will show the opposite negative Cotton effect, wherein curve 1 represents the induced light of 450nm, and curve 2 represents the induced light of 532nm; for the sample induced by right circularly polarized light, as Figure 8As shown, when the wavelength of the induced light is adjusted from 450nm to 532nm, the circular dichroism spectrum will also be reversed accordingly, where curve 1 represents the induced light of 450nm, and curve 2 represents the induced light of 532nm. But on the o...

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Abstract

The invention provides an achiral polymer-based organic electroluminescent circularly polarized light-emitting device which comprises an anode, a hole injection layer, a light-emitting layer, an electron transport layer, an electron injection layer and a cathode which are sequentially superposed. The material of the light-emitting layer is poly (9, 9-dihexylfluorene-co-benzothiadiazole) induced by circularly polarized light. The invention provides an OLED which is based on an achiral polymer (F6BT) and can directly and preferentially emit left-handed or right-handed circularly polarized light. The spiral response of the OLED is easy to control, and the spiral response is not only on the rotational property of inducing the circularly polarized light, but also on the wavelength of inducing the circularly polarized light. According to the OLED provided by the invention, a simpler, more convenient and more efficient design method is provided for realizing the circular polarization luminescence of a traditional achiral compound, and a foundation is laid for preparing a large-area and high-quality chiral micro-nano photoelectric device.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent circularly polarized light-emitting devices, in particular to an organic electroluminescent circularly polarized light-emitting device based on an achiral polymer. Background technique [0002] Organic light-emitting diodes (OLEDs) have won widespread scientific and commercial attention due to their unique properties such as excellent luminous performance, high contrast ratio, wide viewing angle and low power consumption, and have been widely used in flat panel displays and solid-state lighting systems. Circularly polarized luminescence is gradually becoming the core of a series of display and photonic technologies such as high-efficiency backlighting, optical spintronics, and quantum information technology. Using quarter-wave plates, polarizers or beam splitters as passive devices in OLEDs is a typical method to generate circularly polarized light, but it requires many complex ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/54H01L51/50C08G61/12C07F5/02C07D285/14
CPCC07D285/14C07F5/025C08G61/123C08G2261/95H10K85/113H10K50/11
Inventor 程军杰方昱玮邹纲许立新
Owner UNIV OF SCI & TECH OF CHINA
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