Electroluminescent perovskite long-afterglow material, LED prepared from electroluminescent perovskite long-afterglow material and LED preparation method

Abstract

The invention provides an electroluminescent perovskite long-afterglow material, an LED prepared from the electroluminescent perovskite long-afterglow material and an LED preparation method, the LED comprises a cathode, an electron transport layer, a perovskite afterglow luminescent layer, a hole transport layer and an anode which are sequentially prepared on a substrate from bottom to top, two ends of the anode and two ends of the cathode are respectively connected with a pulse alternating current power supply, the perovskite afterglow luminescent layer is prepared from the electroluminescent perovskite long-afterglow material, the chemical structural formula of the perovskite afterglow luminescent layer is AyD1-yBX3, AyD1-yB2X5 or AzD4-zBX6, A is an organic ammonium ion, an inorganic metal ion or a mixture of the organic ammonium ion and the inorganic metal ion, D is a rare earth element, B is a divalent metal ion, X is a halogen ion or a doping of at least two halogen ions, Y and z are real numbers, y is greater than 0 and less than or equal to 1, and z is greater than 0 and less than or equal to 4. According to the invention, rare earth elements are doped into perovskite crystal lattices to form a new electroluminescent perovskite material with long afterglow characteristics, so that an LED prepared from the electroluminescent perovskite material has more advantages in contrast, pure black state, flexibility and the like compared with an LED prepared from a photoluminescent material.

Description

technical field [0001] The invention relates to the technical field of perovskite long afterglow LEDs, in particular to an electroluminescent perovskite long afterglow material, an LED prepared therefrom, and an LED preparation method. Background technique [0002] The long afterglow material can store the absorbed excitation energy and release the energy in the form of light after the light stops, which is a kind of photoluminescent material. Long afterglow materials have the characteristics of light storage, energy storage, and energy saving, and have important application prospects in the fields of emergency lighting, fire safety, architectural decoration, precision detection, and biomarkers. Since the long afterglow material can produce long afterglow luminescence when the excitation light source stops exciting, it is used in AC-driven light-emitting diodes to compensate for the phenomenon that the LED luminescence becomes weak or even flickers due to the change of the c...

AI Technical Summary

Problems solved by technology

But at present, all long-lasting materials are photoluminescent materials. LEDs made of photoluminescent materials need to be equipped with rigid backlights. The existence of rigid backlights has brought huge obstacles to flexible applications. Currently, display And lighting technology is tending to the development of electroluminescent materials, which have incomparable advantages in terms of contrast, pure black state, flexibility, etc.

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