A kind of warm white OLED device and preparation method thereof

Abstract

The invention discloses a warm white OLED device and a preparation method thereof. The structure of the device is characterized in that the light-emitting layer consists of host materials DTCPFB and OXD-7, and guest materials FIrpic, Ir(bt)2(acac), and Ir(ppy)2 (acac) and Ir(MPCPPZ)3; its preparation method is a solution processing method that is comprehensively used for the above-mentioned host-guest materials, and a high-CRI warm white light device is prepared by doping with four primary colors, which can fully meet the ideal lighting requirements. The CRI of the light source must meet the requirements of 80 or higher. Considering the energy level matching and carrier transport balance, the unique device structure type of this system is adopted, which effectively improves 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 blackbody curve is large ( Figure 5 Point A) (Jou.J.H, Hwang.P.Y, Org.Electron.2012, 13, 899)

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