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• W2354211356 abstract "Blue OLED is very crucial to realize full-color displays. It was harder to gain highly efficiency blue OLEDs compared with red and green OLEDs. LiBq_4 was supposed to be a newly potential blue organic light-(emitting) material. As the states of the interface between organic layer and electrode and the film quality of (organic) layer affect the properties of OLEDs, we investigated the surface and interface states of LiBq_4/ITO by using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). LiBq_4 was deposited on ITO coated glass by routine vacuum evaporation. The thickness of LiBq_4 was about 200 nm. The surface morphology of LiBq_4 was checked by AFM within a area of 8.0 μm×8.0 μm both in lateral and topographic force contact modes. XPS was introduced to study the surface and interface electronic states of LiBq_4/ITO. The scan spectrum was analyzed and the peaks of elements were deconvoluted to further investigate the chemical states of LiBq_4.AFM results show that the surface of LiBq_4 on ITO was very rough with many cracks and pores, indicating poor film quality of LiBq_4 on ITO. From the analysis of the XPS spectrum, we found that, the concentration of contaminated C atoms was very high in the surface of LiBq_4/ITO, which reduced significantly in the interface. This was another proof of the existence of cracks and pores in LiBq_4, that these cracks and pores can lead to heavy absorption of gas molecules; LiBq_4 was partially oxidized showed by the emergency of an oxidizing cha-(racterized) shoulder peak in the C1s spectrum; The relative concentration of B atoms reduced in the interface, which indicate that some B atoms detached from LiBq_4 and lead to the further oxidization of LiBq_4; from the spectrum of N1s, we found that unlike the case in Alq_3, no evidence shows B atoms bonding to N atoms through coordination, which leads to blue shift of the EL spectrum of LiBq_4. But in the interface, a new shoulder peak emerged which may be caused by N atoms bonding with In and Sn atoms came from ITO layer. It may affects the EL spectrum of LiBq_4 based OLEDs. From the B1s spectrum, we can also see that B atoms were in high valence, which agreement with LiBq_4 molecular structure." @default.
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• W2354211356 date "2005-01-01" @default.
• W2354211356 modified "2023-09-27" @default.
• W2354211356 title "Surface and Interface Analysis of LiBq 4 /ITO Using Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS)" @default.
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