Warm white light OLED device and preparation method thereof

Abstract

The invention discloses a warm white light OLED device and a preparation method thereof. The device is structurally characterized in that a light emitting layer is formed by subject materials DTCPFB and OXD-7 and object materials FIrpic, Ir(bt)2(acac), Ir(ppy)2(acac) and Ir(MPCPPZ)3. The preparation method is a solution processing method in which the subject materials and the object materials are synthesized and used comprehensively, a high-CRI warm white light device is prepared by adopting a four-primary-color doping mode, and a requirement that the CRI of an ideal illumination light source needs to reach over 80 can be completely satisfied. The unique device structure type of the system is adopted when considering from the aspects of energy level matching and carrier transport balance, thereby effectively improving the spectral stability of the device.

Description

technical field [0001] The invention relates to the field of OLED devices, in particular to a warm white OLED device and a preparation method thereof. Background technique [0002] CCT (Correlated Color Temperature, correlated color temperature) refers to the Kelvin temperature when the thermal black body radiator matches the color of the light source. Frequent exposure to improper light sources such as high CCT or short-wavelength light at night will increase the risk of cancer (such as breast cancer, rectal cancer, prostate cancer, etc.). To obtain a physiologically friendly white light source, the light source must have a low CCT. A light source with a CCT lower than 6000K is called a warm white light source. [0003] OLEDs (Organic Light Emitting Diodes, Organic Light Emitting Diodes) have received extensive attention in the field of solid-state lighting due to their thinness, self-luminescence and other advantages. Research on warm white OLED light sources has also ma...

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Problems solved by technology

However, since the three phosphorescent guest emission spectra adopted in this method are not wide enough, and the aggregation of guest dyes is easily formed in the light-emitting layer, the CRI (Color Rendering Index, color rendering index) of the device is not high enough, and the spectral stability is still poor, and The color deviation of CIE (Commission International de L'Eclairage, International Commission on Illumination) color coordinates deviates from the black body curve is large ( Figure 5 Point A) (Jou.J.H, Hwang.P.Y, Org.Electron.2012, 13, 899)

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