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Light emitting diode

A technology of light-emitting diodes and electrodes, which is applied to electrical components, circuits, semiconductor devices, etc., can solve problems such as component characteristic degradation, and achieve the effects of prolonging life, uniform light emission, and improving performance.

Inactive Publication Date: 2009-02-11
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a second problem, if openings are provided in the original light-emitting area in order to improve the light extraction of the LED, there is a problem that the device characteristics will be deteriorated due to the increase in the resistance of the LED.

Method used

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  • Light emitting diode
  • Light emitting diode
  • Light emitting diode

Examples

Experimental program
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Effect test

Embodiment approach 1

[0044] The LED of Embodiment 1 will be described based on FIGS. 1 and 2 . The LED according to this embodiment is an LED in which a p-side electrode and an n-side electrode are arranged on the same surface side as shown in the figure. FIG. 1 is a schematic view of the LED of the present embodiment seen from the side where the electrodes are arranged. In addition, FIG. 2 is a schematic cross-sectional view showing the layer structure of the LED of the present embodiment, and shows a cross-sectional view taken along line II-II in FIG. 1 .

[0045] As shown in FIG. 1 , the LED according to Embodiment 1 of the present invention has a rectangular shape long in a predetermined direction when viewed from the side where the electrodes are disposed. In this embodiment, it is a rectangle in which one pair of sides is longer than the other pair of sides. Furthermore, the n-side connecting portion 9-1 is arranged near one end in the longitudinal direction of the rectangle, and the p-sid...

Embodiment approach 2

[0073] The LED of Embodiment 2 is demonstrated based on FIG.3, FIG.4. Fig. 3 is a schematic diagram of the LED of the present embodiment seen from the electrode placement surface side. 4 is a schematic cross-sectional view showing a layer structure of an LED according to Embodiment 2, showing a cross-section taken along line IV-IV in FIG. 3 . In addition, the same code|symbol is attached|subjected to the component which has the same function as Embodiment 1.

[0074] The LED of this embodiment has the same structure as that of the LED described in Embodiment 1, except that the p-side current spreading portion 10a has a plurality of openings 10aa. In addition, the p-side pad portion does not have the p-side extension, and this configuration prevents light emitted from the active layer from being blocked by the p-side extension, which is ideal in terms of light extraction. Of course, a structure having a p-side extension may also be employed if current spread is taken into con...

Embodiment approach 3

[0083] according to Figure 5 , Figure 6 The LED of this embodiment will be described. In addition, the same code|symbol is attached|subjected to the component which has the same function as Embodiment 1. The LED of this embodiment basically has the same structure as the LED of Embodiment 1 except for the following structural differences.

[0084] That is, in the LED of the present embodiment, as described above, the p-side current spreading portion 10a reaches the n-side connection portion region, and the n-side pad portion 9-1 and the p-side pad portion 10b-1 are formed from the side of the electrode arrangement surface. Looking at each LED, they are arranged on the diagonals of the rectangular LEDs. In addition, the n-side extension portion 9-2 and the p-side extension portion 10b-2 partially face each other. In addition, a region exposed to the n-type contact layer 4 exposed to form an n-side electrode has a plurality of protrusions 11 for enhancing light extraction so...

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Abstract

A long-life light emitting diode for further making uniform light emission without an excessive current concentration and improving a light pick-up efficiency. The light emitting diode comprises, when viewed from an electrode-disposed surface side, an n-side electrode consisting of an n-side connection unit (9-1) to be connected with a conductive member and an n-side stretching unit (9-2) stretching in a longitudinal direction from the specified part of an n-side connection unit, and a p-side pad unit consisting of at least a p-side connection unit (10b-1) to be connected with a conductive member, and is further provided with an n-side connection area in which an n-side connection unit is disposed in the vicinity of one end thereof in a longitudinal direction, a p-side connection area in which a p-side connection unit is disposed in the vicinity of the other end thereof in a longitudinal direction, and an intermediate area positioned therebetween, wherein the n-side stretching unit is located in the intermediate area and stretches to face a p-side current diffusion unit in the intermediate area.

Description

technical field [0001] The present invention relates to a layer structure comprising a nitride semiconductor (In X Al Y Ga 1-X-Y N, 0≦X, 0≦Y, X+Y≦1) light-emitting diodes, in particular, firstly, it relates to a light-emitting diode that makes light emission uniform and improves its lifespan, and secondly, it relates to a light-emitting diode that improves the light emission to the observation surface side. light-emitting diodes. Background technique [0002] Light-emitting diodes containing nitride semiconductors in their layer structure are widely used in various fields such as full-color LED displays, traffic lights, and backlights as high-brightness pure green light-emitting LEDs and blue light-emitting LEDs. [0003] These LEDs generally have a structure in which an n-type nitride semiconductor layer, an active layer, and a p-type nitride semiconductor layer are sequentially stacked on a substrate such as sapphire. In addition, a p-side electrode is arranged on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/00
Inventor 坂本贵彦楠濑健
Owner NICHIA CORP