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Organic compound, light-emitting element, light-emitting device, electronic device, and lighting device

專利號
US10868258B2
公開日期
2020-12-15
申請人
Semiconductor Energy Laboratory Co., Ltd.
發(fā)明人
Miki Kurihara; Hideko Yoshizumi; Hiromitsu Kido; Tatsuyoshi Takahashi; Satoshi Seo
IPC分類
H01L51/50; H01L51/00; C07D491/048; C07D495/04
技術(shù)領(lǐng)域
emitting,light,skeleton,8cz,layer,compound,in,phenyl,material,electron
地域： Kanagawa-ken

摘要

A novel organic compound is provided. Moreover, a light-emitting element with high emission efficiency and a long lifetime is provided. A novel organic compound having a bicarbazole skeleton and a benzofuropyrimidine skeleton or a benzothienopyrimidine skeleton that includes at least one condensed ring or two condensed rings is provided. Moreover, a light-emitting element including the organic compound is provided.

說明書

A light-emitting element 5 was fabricated through the same steps as those for the comparative light-emitting element 3 except for the steps of forming the light-emitting layer 130 and the electron-transport layer 118.

As the light-emitting layer 130 over the hole-transport layer 112, 8Cz-4mPCCzPBfpm, PCCP, and GD270 (manufactured by Jilin Optical and Electronic Materials Co., Ltd.) were deposited by co-evaporation in a weight ratio of 8Cz-4mPCCzPBfpm:PCCP:GD270=0.5:0.5:0.1 to a thickness of 40 nm. Note that in the light-emitting layer 130, GD270 corresponds to the guest material that emits phosphorescence.

As the electron-transport layer 118, 8Cz-4mPCCzPBfpm and BPhen were sequentially deposited by evaporation to thicknesses of 20 nm and 15 nm, respectively, over the light-emitting layer 130.

<Characteristics of Light-Emitting Elements>

The current efficiency-luminance characteristics of the fabricated comparative light-emitting element 3 and the fabricated light-emitting elements 4 and 5 are shown in FIG. 25. The current density-voltage characteristics thereof are shown in FIG. 26. The external quantum efficiency-luminance characteristics thereof are shown in FIG. 27. The measurements of the light-emitting elements were performed at room temperature (in an atmosphere kept at 23° C.). FIG. 28 shows the electroluminescence spectra obtained when a current at a current density of 2.5 mA/cm2 was supplied to the comparative light-emitting element 3 and the light-emitting elements 4 and 5. The measurements were performed at room temperature.

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