Light emitting device and manufacturing method thereof

A light emitting device, wherein comprising:

• a substrate;
• an LED chip disposed on a surface of said substrate;
• a quantum dot composite layer arranged on a surface of said LED chip away from said substrate;
• and
• a first protective layer arranged on a surface of said quantum dot composite layer away from said LED chip;
• wherein, said quantum dot composite layer comprises a water-soluble polymer matrix and quantum dots dispersed in said water-soluble polymer matrix, and the material of said first protective layer is one of a first inorganic oxide and a first water-blocking polymer, and the material of said water-soluble polymer matrix is an oxygen-blocking polymer;
• the material of said water-soluble polymer matrix is one or more of polyvinylpyrrolidone, polyacrylamide, polyvinyl alcohol, polyacrylic acid, cellulose and alkyd resin;
• the material of said quantum dot composite layer comprises a water-soluble polymer matrix and a microstructure dispersed in said water-soluble polymer matrix, and said microstructure comprises a quantum dot and a dispersion medium for dispersing said quantum dot, wherein, the polarity of said water-soluble polymer matrix is opposite to the polarity of said quantum dot, and said polarity of said water-soluble polymer matrix is opposite to the polarity of said dispersion medium;
• said quantum dot is an oil-soluble quantum dot, and said dispersion medium is one of a quantum dot solvent and a hydrophobic polymer;
• said quantum dot solvent is a nonpolar organic solvent;
• said nonpolar organic solvent has a boiling point of ≥100° C.;
• said hydrophobic polymer is selected from one or more of compounds represented by the following structures of Formula I, Formula II and Formula III:
• said A1 is
• said A2 is
• said n is 6˜30,
• said R1, said R2, said R3 and said R4 are selected independently from any one of methyl, siloxy, phenyl, or combination thereof;
• said R5, said R6 and said R7 are selected independently from any one of methyl, phenyl, or combination thereof;
• said B1 and said B3 are selected independently from any one of methyl, phenyl, or combination thereof, and said B2 is selected from one of
• and said m, said p and said q are independently 2˜10;
• said Y is a C3˜C16 branched or straight chain alkane segment;
• said L is one of an amino, carboxyl and sulfhydryl group.