The Study Of Solution-processed Organic Optoelectronic Devices

Organic light-emitting diode (OLED for short), compared to the first generation displayrepresented with the CRT and the second generation display represented by LCD, with selflight-emission, light weight, thin form factor, wide view-angle, low energy consumption, fastresponse, wide operation temperature, flexibility, etc, has been widely favored in recent years,is considered to be the most ideal and the most promising next generation flat panel displaytechnology.According to different luminescent material molecular weight, OLED display can bedivided into small molecule materials display (SMOLED) and polymer materials display(PLED). SMOLED started early, but due to the need for expensive vacuum evaporationequipment and high precision mask and registration system, the cost is relatively high. PLEDhas simple structure, forming film under the normal pressure by a variety of wet preparationtechnologys, do not need for expensive vacuum equipment. Moreover, it is suitable for largeglass substrate, realizing low price and having high production efficiency, has gooddevelopment prospect.At present, the realization of full color OLED technologys are vacuum evaporation maskmethod, ink-jet printing technology, laser transfer technology, color conversion method andcolor film method, etc. Ink-jet printing has many advantages, such as the design and textproduction capacity and large devices production, saving a large number of materials, suitablefor the flexible and glass substrates, not sensitive to substrate defects, light color uniform, etc.,it is the mainstream method to realizing the full-colored PLED. In the process of ink-jetprinting PLED full-color displays, printing ink modulation, regulation of the droplet, filmuniformity and optimization of device structure are the key to the preparation of highperformance display. We use hybrid inkjet printing (HIJP) technology to prapare the ink-jetprinting PLED full-color display. A thin blue emitting layer is spun on the PEDOT layerfirstly, red emitting and green emitting materials are ink-jetted into the related pixelsrespectively, and compact, uniform and pinhole less emitting layer films can be obtained.Then through effective energy transfer, the effective emitting of RBG are finally realized.Secondly, by blending the red emitting material–PFO-DHTBT with a small amount of P-PPV, the brightness and efficiency of the red emitting are improved effectively. In addition,by choosing a relatively small molecular weight of P-PPV material, the stable droplet can beobtained. By solving the related issues, we successfully made a1.5-inch PLED full-colordisplays without defects.Solar energy is environmental, no pollution, high use value, clean, pollution-free. It is aninexhaustible, inexhaustible ideal new energy. Solar cell uses the photoelectric conversiontechnology to convert the solar energy into electricity. Because of its abroad material sourcesand cheap price, good processability, physical modification, diversification of the battery’sprocessing, thin and flexible etc, organic solar cell, especially polymer solar cell, is analternative to silicon-based inorganic semiconductor, and become the focus of research athome and abroad.Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)（PEDOT:PSS） is widely usedin organic photovoltaic device as the hole transport layer, so as to obtain high energyconversion efficiency. But the noamal PEDOT (AI4083) is acidic, and it will etch ITO, thenreduce energy conversion efficiency and stability of device. We adopt pH neutral PEDOTreplace acid PEDOT to make polymer solar cell devices. By applied some simple processingson the surface of a neutral PEDOT film, the efficiency of the neutral PEDOT device afterprocessings is more than doubled compared to the untreated neutral PEDOT device, and isslightly higher than the efficiency of the acid PEDOT device. By X-ray photoelectronspectroscopy analysis, whether the acidic PEDOT samples which are stored in the air forsome days, or the active layer samples which use the acidic PEDOT as substrate and werestored in the same conditions, In element could be detected in the surfaces of two typesamples. And in corresponding neutral PEDOT samples and active layer samples, In elementwere not detected, it is illustrated that the neutal PEDOT can restrain the diffusion of Inelement into the hole transport layer and the active layer effectively, the lifetime of the neutralPEDOT device is more than doubled compared with the acidic PEDOT device.