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Lithium nitride is a metal nitrogen compound with a molecular formula of Li3N. It is a purple or red crystalline solid with a light green luster in reflected light and a ruby color in transmitted light.

The Property of Lithium Nitride:

At room temperature, metallic lithium can partially generate lithium nitride when exposed to the air. Lithium generates lithium nitride in a nitrogen stream, which is 10-15 times faster than in the air. At this time, all lithium is converted into lithium nitride. Compared with this property, it is difficult for other alkali metals to form nitrides. For example, sodium nitride can only be prepared by deposition on sapphire with atomic beam at low temperature, and it will decompose after a little heating.
Lithium nitride is easily dissolved to generate lithium hydroxide and ammonia gas, especially fine powdered lithium nitride, which can burn violently when heated in air. Therefore, lithium nitride must be handled in an inert atmosphere (such as nitrogen).

The Application of Lithium Nitride:

Solid electrolyte
Lithium nitride is a fast ion conductor and its conductivity is higher than other inorganic lithium salts. There have been many studies on the application of lithium nitride as a solid electrode and cathode material for batteries.

Preparation of cubic boron nitride
In addition to being used as a solid electrolyte, lithium nitride is also an effective catalyst for the conversion of hexagonal boron nitride to cubic boron nitride.

Electron injection layer of organic light emitting device
Organic Light-Emitting Device (OLED) has the advantages of full solid state, active light emission, wide viewing angle, fast response speed (<1 ms), large operating temperature range, can be fabricated on a flexible substrate, and low unit power consumption. Lithium nitride (Li3N) is used as an n-type dopant to be incorporated into the electron transport material tris (8-hydroxy quinoline) aluminium (Alq3) layer to improve the performance of OLED devices.

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