Abstract
AbstractMonochromatic light‐emitting diodes of different sizes and colors are widely used as small display devices. However, diodes of different colors for commercial purposes are those having a combination of red light‐emitting pellets and green light‐emitting pellets. Such a combination involves problems of color uniformity and brightness degradation. Therefore, a single pellet which has different uniform colors was proposed several years ago, but it has not yet been marketed due to many technical difficulties. The authors succeeded in making a single pellet with a green light‐emitting part and a red light‐emitting part on both sides of a GaP substrate. By changing the current ratio of the current flowing through the device, different colors were attained. This paper deals with different technical problems associated with device fabrication and the solutions to these problems. Also, electrical and optical properties of the device are discussed.
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