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Light-emitting element, light-emitting device, electronic device, lighting device, and organic compound

專利號(hào)
US11800799B2
公開(kāi)日期
2023-10-24
申請(qǐng)人
Semiconductor Energy Laboratory Co., Ltd.
發(fā)明人
Satoshi Seo; Takao Hamada; Tatsuyoshi Takahashi; Yasushi Kitano; Hiroki Suzuki; Hideko Inoue
IPC分類
H10K85/60; C07D403/14; H10K85/30
技術(shù)領(lǐng)域
emitting,light,2mpcczpdbq,2pcczpdbq,element,compound,in,dibenzo,layer,nm
地域: Kanagawa-ken

摘要

To provide a light-emitting element with an improved reliability, a light-emitting element with a high current efficiency (or a high quantum efficiency), and a novel dibenzo[f,h]quinoxaline derivative that is favorably used in a light-emitting element which is one embodiment of the present invention. A light-emitting element includes an EL layer between an anode and a cathode. The EL layer includes a light-emitting layer; the light-emitting layer contains a first organic compound having an electron-transport property and a hole-transport property, a second organic compound having a hole-transport property, and a light-emitting substance; the combination of the first organic compound and the second organic compound forms an exciplex; the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound; and a difference between the HOMO level of the first organic compound and the HOMO level of the second organic compound is less than or equal to 0.4 eV.

說(shuō)明書(shū)

Then, FIG. 14 shows the absorption spectrum and the emission spectrum of 2mPCCzPDBq in a toluene solution of 2mPCCzPDBq, and FIG. 15 shows the absorption spectrum and the emission spectrum of 2mPCCzPDBq in a thin film of 2mPCCzPDBq. The spectra were measured with a UV-visible spectrophotometer (V550, produced by JASCO Corporation). The spectra of 2mPCCzPDBq in the toluene solution of 2mPCCzPDBq were measured with the toluene solution of 2mPCCzPDBq put in a quartz cell. The spectra of 2mPCCzPDBq in the thin film of 2mPCCzPDBq were measured with a sample fabricated by deposition of 2mPCCzPDBq on a quartz substrate by evaporation. Note that in the case of the absorption spectrum of 2mPCCzPDBq in the toluene solution of 2mPCCzPDBq, the absorption spectrum obtained by subtraction of the absorption spectra of the quartz cell and toluene from the measured spectrum is shown, and in the case of the absorption spectrum of 2mPCCzPDBq in the thin film of 2mPCCzPDBq, the absorption spectrum obtained by subtraction of the absorption spectrum of the quartz substrate from the measured spectrum is shown.

As shown in FIG. 14, in the case of 2mPCCzPDBq in the toluene solution of 2mPCCzPDBq, the absorption peaks were observed at approximately 305 nm and 374 nm, and the emission wavelength peak was observed at 480 nm (excitation wavelength: 305 nm). As shown in FIG. 15, in the case of 2mPCCzPDBq in the thin film of 2mPCCzPDBq, the absorption peaks were observed at approximately 208 nm, 257 nm, 308 nm, 361 nm, and 379 nm, and the emission wavelength peak was observed at 515 nm (excitation wavelength: 380 nm).

EXAMPLE 3 Synthesis Example 3

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