Light emitting efficiency

Furthermore, we tested pH dependency for the new chemiluminescence substrate and found that pH 10.0 to give the highest light emitting efficiency as shown in Figure 1. 

Hyperbranch also attracts a lot of interest for developing efficient electroluminescent devices. Since the hyperbranched and globular structure can depress the interchain interaction and excimer formation so as to make the materials form high-quality amorphous films, and consequently improve the stability, light-emitting efficiency, and emission color purity. Bo and coworkers reported the first example of hyperbranched polymers used as blue light-emitting materials in 2004 (Li and Bo, 2004). They adopted a novel ABa + AB ... 

Light emitting efficiencies in organic light emitting diodes (OLEDs)... 

Light Emitting Efficiencies In Organic Light Emitting Diodes(OLEDs)... 

A light-emitting diode (LED) is a forward-biasedp—n junction in which the appHed bias enables the recombination of electrons and holes at the junction, resulting in the emission of photons. This type of light emission resulting from the injection of charged carriers is referred to as electroluminescence. A direct band gap semiconductor is optimal for efficient light emission and thus the majority of the compound semiconductors are potential candidates for efficient LEDs. 

The enormous progress in the field of electroluminescent conjugated polymers has led to performances of oiganic light-emitting devices (LEDs) that are comparable and in some aspects superior to their inorganic counterparts 11). Quantum efficiencies in excess of 5% have been demonstrated [2] and show that a high fraction of the injected carriers in a polymeric electroluminescence (EL) device form electronic excitations which recombine radiatively. 

From the perspective of the strategies aimed at fabrication of efficient blue LEDs, the results outlined above regarding yellow LPPP light emitting diodes are, nevertheless, unsatisfactory. In order to prepare blue LEDs from LPPP materials, it is necessary to efficiently mask out or suppress the dominant yellow aggregate emission. 

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