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发明申请
US20160118605A1 Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device 审中-公开
发光元件，发光装置，电子装置和照明装置

Light-Emitting Element, Light-Emitting Device, Electronic Device, and Lighting Device
摘要：
A long-life light-emitting element is provided by reducing a specific kind of impurity in the light-emitting element, particularly an impurity originating in an iridium complex. The light-emitting element includes an iridium complex. The iridium complex includes an iridium metal and a ligand coordinated to the iridium metal. In analysis of the light-emitting element by liquid chromatography mass spectrometry using a chromatograph of a photodiode array detector, the proportion of the peak area of a ligand not coordinated to the iridium metal to the peak area of the iridium complex is greater than or equal to 0% and less than or equal to 10%.
摘要（中）：

通过减少发光元件中的特定种类的杂质，特别是源于铱络合物的杂质，提供长寿命的发光元件。 发光元件包括铱络合物。 铱络合物包括铱金属和与铱金属配位的配体。 在通过使用光电二极管阵列检测器的色谱仪的液相色谱质谱法分析发光元件时，不与铱金属配位的配体的峰面积与铱络合物的峰面积的比例大于或等于 至0％且小于或等于10％。

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