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Organic color emission

OLEDs are nowadays the most important type of light source for artificial lighting, making them potential candidates in the development of full-color flat panel display devices. Challenging problems to be addressed are emission color, emission efficiency and device lifetime. The emission color problem results from the broad emission bands exhibited by electroluminescent devices containing organic emitting layers, since pure and sharp emission bands from these materials, a requisite for display applications, are... [Pg.161]

Liquid dyes lasers tunable in the visible range have been known since the middle of the sixties. They are based on organic colorants dissolved in various solvents. The light absorption from the pump source brings the dye molecule to its excited singlet state, and the emission to the terminal vibrational state can then be turned by using appropriate resonant cavities to produce laser emission in the spectral range of fluorescent emission. [Pg.1427]

As can be seen, the efficiency of LSCs obtained by the incorporation of organic colorants into a transparent matrix was low. The main factor responsible for a decrease in luminescence that is especially important in large plates is the overlap between absorption and emission of fluorescent organic molecules. Therefore, in order to overcome this difficulty, there is a need to use systems in which the absorption and emission arise from different levels. This can be achieved by using either proton transfer compounds [44,45] or the specific properties of luminescence of lanthanide complexes [46-49]. [Pg.1290]

PMs are orange-colored, with an absorption maximum at 488 nm (Fig. 9.6). The absorption characteristics and chemiluminescence activities of those compounds are shown in Table 9.4. All PMs are brightly fluorescent in yellow in organic solvents and also in aqueous solutions containing a surfactant (emission maxima 520-530 nm). The chemiluminescence spectra of PMs are significantly affected by the... [Pg.284]

CL emissions can be characterized by four parameters, including color, intensity, rate of production, and decay of intensity. The properties of several organic, chemiluminescent reactions known to produce emissions of light are shown in Table 1. [Pg.106]

It was shown that adding low oxidation potential material to PFs can stabilize the emission color and increase the device efficiency [321]. However, using low-molecular-weight organic dopants causes several problems such as phase separation and crystallization. These problems can be partially solved by using polymer blends. Cimrova and Vyprachticky [334] reported... [Pg.144]

The sixth class of green emitters is metal organic complexes. Alq3 was the first green emitter. Alq3 emission exhibits relatively saturated green color (CIE 1931 coordinates (0.32,0.55)) and so far, it is still one of the best green emitters available. [Pg.343]


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Emission color

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