White-emitting LEDs

Meanwhile, two suppliers of white-emitting LEDs using the YAG Ce converter are on the market Nichia (see also [3]) and Oxley [4],... 

Jordan et al. have developed a white organic LED technology also based on the Alq/TAD system.37 The blue component of the spectrum is augmented by introducing a thin layer of a blue-green emitting material between the Alq and the TAD. The use of a dye-doped Alq layer in the device adds to the red component of the combined emission spectrum. In this manner, efficient (0.7% external quantum efficiency) and bright (4750 Cd/m2) LEDs have been fabricated with emission colors that are close to white. 

Mazzeo M., Thompson J., Blyth R.I.R., Anni M., Gigli G., Cingolani R., "White light from blue white emitting organic LEDs based on spin coated blends of blue-emitting molecules", Physica E Law-dimensional Systems and Nanostructures, 13, 2-4, March 2002, Pages 1243-1246. 

A method of white light illumination uses the electroluminescence of semiconductor light-emitting diodes (LEDs), either singly or by the combination of red, green, and blue emitting diodes. However, white organic LEDs suffer from relatively short... 

Furthermore, the flowcharts of design and preparation of white-emitting oxide and sulfide phosphors for UV LEDs are also shown, respectively in Fig. 2.8. 

According to the flowcharts showing the design and preparation protocol, we have demonstrated that the white-emitting phosphors for UV and blue LEDs can be obtained and used to generate white light. In addition, a series of trichromatic... 

Das S, Yang CY, Lin HC, Lu CH (2014) Structural and luminescence properties of tunable white-emitting Sro.5Cao.5Al204 Eu, Dy for UV-excited white-LEDs. RSC Adv 4 64956... 

Conjugated Polymer Blends as Emitting Layer for White Light LED... 

Soft, silver white metal that melts in the hand (29.8 °C) and remains liquid up to 2204 °C (difference 2174 °C, suitable for special thermometers). Gallium is quite widespread, but always in small amounts in admixtures. Its "career" took off with the advent of semiconductors. Ga arsenide and Ga phosphide, which are preferential to silicon in some applications, have extensive uses in microchips, diodes, lasers, and microwaves. The element is found in every mobile phone and computer. Ga nitride (GaN) is used in UV LEDs (ultraviolet light-emitting diodes). In this manner, a curiosity was transformed into a high-tech speciality. 

Although the element is a metalloid, the long, brittle, crystals have a metallic shine. The white, tasteless oxide (arsenic trioxide As203) has been famous and notorious ("inheritance powder") even after centuries traces can be found in bodies. The arsenic compound "Salvarsan" was first used by Paul Ehrlich for the treatment of syphilis — the start of chemotherapy. Popular today as a semiconducting material. Component of LEDs (light-emitting diodes) and lasers. Arsenic hardens lead, used earlier in letter-press printing, today only for lead shot. 

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