High performance AlGaInP visible light-emitting diodes

Abstract

The performance of surface-emitting visible AlGaInP light-emitting diodes (LEDs) is described. The devices have external quantum efficiencies greater than 2% and luminous efficiencies of 20 lm/A in the yellow (590 nm) spectral region. This performance is roughly ten times better than existing yellow LEDs and is comparable to the highest performance red AlGaAs LEDs currently available. The devices also perform favorably compared to existing devices in the orange and green spectral regions. Low-pressure organometallic vapor phase epitaxy (OMVPE) is used to grow the epitaxial layers. The devices consist of a double heterostructure with an AlGaInP active region grown on a GaAs substrate.

Inorganic Semiconductors for Light‐emitting Diodes

“…Current-spreading layers are employed in top-emitting LEDs. A GaP current-spreading layer in an AlGaInP LED was reported by Kuo et al [26] and Fletcher et al [27,28]. AlGaAs current-spreading layers in AlGaInP LEDs were reported by Sugawara et al [29][30][31].…”

The Promise and Challenge of Solid-State Lighting

“…Workers at Hewlett Packard 6 and Toshiba 7 used AlInGaP to develop high-brightness red and amber sources and Shuji Nakamura at Nichia demonstrated that it was possible to produce high-brightness green and blue LEDs. 8 The performance of LED devices, like that of their organic counterparts, steadily increased during the 1990s.…”

Analysis of the LED Lamp Arrangement for Uniformity of Illumination in Indoor VLC System

“…djk is the distance between the jth reflective unit and the kth receiver. Once the matrices Dt×r, Ft×n, and Mn×r are determined, the illumination on the receiving plane can be gained by equation (6). Different arrangements will lead to different illumination distributions.…”

“…Compared with the previous lighting devices, the white LED is more advantageous in terms of high brightness, lower power consumption, smaller size, longer lifetime, and environmental protection [3][4][5]. Because of these advantages, the white LED is considered as a strong candidate for the future lighting technology and will replace most of the conventional light sources in offices and homes [6][7][8]. Generally speaking, the LED lamps are not only used as a lighting device, but also to be used as a communication device [9].…”