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Signal transducer and activator of transcription (STAT) proteins with transcriptional activity, which are involved in the pathogenesis and formation of skin lesions of atopic dermatitis, psoriasis, skin tumors and other dermatosis, and are related to the severity of dermatosis. Different STAT has different pathways in dermatosis. STAT regulate cell signal transduction, affect the expression of downstream factors, and exert biological effects. Further study of STAT expression level and targeted genes to explore the relationship between STAT and dermatosis will help to find potential therapeutic targets for dermatosis.

In this paper, a series of ITO/ZnO/ZnO nanorods/MEH-PPV/Al were prepared with different thicknesses of MEH-PPV that were changed from 15, 10 to 7 nm. The electric field in the devices was analyzed. An increase in the electric field on ZnO made hole injection easy and the electrons tunnel fast through thinner MEH-PPV to ZnO. This made the carriers prefer to recombine inside the ZnO layer, and the emission of ZnO was predominant under direct current (DC) bias. Furthermore, another device was fabricated with the structure of AZO (Al-doped ZnO)/ZnO/ZnO nanorods/MEH-PPV/Al. Ultra-violet (UV) electroluminescence (EL) at 387 nm from ZnO band edge emission was realized under DC bias. The turn-on voltage of the devices having AZO as the electrode is lower than that of ITO, and the EL power is enhanced. This work also studies the effect of inserting LiF underneath the Al electrode and above the layer of MEH-PPV. The LiF film inserted caused an obvious decrease in turn-on voltage of the devices and a pronounced increase in the EL power. The mechanism of electroluminescence enhancement is also discussed.