A low-voltage and high-color-stability white organic light-emitting diode

Abstract

A low-voltage, high-color-stability white organic light-emitting diode, consisting of a glass substrate with an ITO anode, a composite hole injection layer, a hole transport layer, a blue light emitting layer, a blue light transition layer, an orange-red light emitting layer, an electron transport layer Layer, electron injection layer, electron buffer layer and metal cathode form a laminated structure in turn, and the composite hole injection layer is composed of two layers of F4‑TCNQ and two layers of pentacene alternately. The advantages of the present invention are: the light-emitting diode adopts a composite hole injection layer and a TCNQ electron injection layer formed by alternating combinations of F4-TCNQ and pentacene, which can respectively improve the hole and electron injection capabilities of the organic light-emitting diode, and effectively reduce the The driving voltage of the device is improved and the luminous brightness and efficiency are improved; the blue light transition layer with a thickness of 5nm improves the color stability of the white organic light-emitting diode, and white light with a stable luminous spectrum is obtained; the device as a whole has low driving voltage, high brightness, High efficiency and good color stability.

Description

Technical field [0001] The invention belongs to the technical field of organic light emitting diodes (OLED), and specifically relates to a white light organic light emitting diode with low voltage and high color stability. Background technique [0002] Organic light-emitting diode (OLED) is gradually becoming a very popular emerging flat panel display product with its outstanding advantages. It has active light emission, high brightness, wide viewing angle, high image quality, low power consumption, fast response speed, and manufacturing process. Simple and flexible. At the same time, it can also be used as a solid-state lighting source due to its advantages such as all-solid-state, surface-emitting, DC drive, rich and adjustable colors, and high luminous efficiency. As a lighting source, the light emitted by white light OLEDs is closer to natural sunlight, harmless to human eyes, and has the advantages of high color rendering index (CRI) and energy saving. The white light OLED...

AI Technical Summary

Problems solved by technology

However, due to the low carrier mobility of the organic semiconductor material itself, the number of carriers injected into the light-emitting layer is small and the carriers in each light-emitting layer are unbalanced, which ultimately affects the driving voltage and luminous efficiency of white OLEDs. adversely affect

At the same time, the imbalance of carriers in each light-emitting layer also makes the color stability of white OLED poor, that is, it emits white light of different hues under different voltages (for example, the emission hue changes from warm white to cool white as the voltage increases)

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