New material innovation value - LED package alloy wire overview

[Source: Gaogong LED 's " LED Good Products" magazine March issue ]

In the past half century, the production cost of semiconductors has dropped dramatically, while production technology has continued to improve, and productivity and product yields have continued to increase. I remember the vice president Tom Morrow said: Today's LEDs also have the same market driving force, LED will be a fast pace to high-brightness, low-cost popularization. If the theoretical basis of this law is not keeping up with the pace of double the performance per month, it will be difficult to compete in the market; based on this, it will keep up with the rhythm of the continuous reduction of the production cost of LED products in the market. Another important indicator of the survival of LED companies.

As an important part of the industry, LED packaging, with the gradual reduction of the price of finished products, under the premise of keeping up with the industrial development technology, it is necessary to do its own cost control, in order to occupy a place in this competitive industry. Therefore, in recent years, the prices of the main raw materials such as chips, phosphors, and brackets have been greatly dived, and the price has been competitive for several times, and there is almost no room for compression. Among them, although the original cost of the package gold wire is small, but on the basis of the decline in prices of other materials, the proportion has gradually expanded, so the selection of packaging wire replacement materials has become an important part of the packaging industry can not be ignored, so since 2012 Since the beginning of the year, many packaging industries have followed the footsteps of semiconductor packaging to actively look for package wires such as silver and copper.

In the past ten years, the market of gold has gradually increased, which has accelerated the proportion of the cost of gold wire. Therefore, the use of silver, which is also a platinum group element, as an alternative material for alloy wire has been born. Gold is a platinum-based noble metal, in which silver and gold are the first choice for alloying elements, and platinum and palladium are neighboring elements as trace auxiliary elements. Silver alloys are developed by material manufacturers under such a basic background. come out.

The price of silver-based package alloy wire can be more than 85% lower than that of pure gold packaging wire. Compared with the overall LED lamp bead product, it has at least about 6%-15% reduction according to product structure. This large decline also deeply stunned the packaging industry. Also, because the silver alloy is easier to weld with the silver-plated bracket, the change of the bond crystal structure is also 15-20% higher than that of the pure gold wire after the wire bonding; the brightness of the silver alloy wire product can also be increased by about 1%- Around 3%, these are the benefits of using silver alloy wires.

However, the high-silver alloy wire also has its own disadvantages, because the chemical properties of silver are more active than gold, and it is easy to oxidize and vulcanize when exposed to air; the range of parameter variables corresponding to the wire bonding machine is reduced, which requires the wire bonding technical engineer to have A few of the welding wire has a lot of debugging skills.

In addition, the high-silver alloy wire occasionally has the first solder point ball golfing phenomenon, so for the application of the high-silver alloy wire, a nitrogen gas blowing device is selectively used as the first solder joint ball for the welding wire. However, depending on the product design, packaging equipment and supporting equipment, there is no need for nitrogen assistance. Generally, it is not necessary to use nitrogen as a wire bonding aid in PCB products.

Unfinished , please refer to the March issue of Gaogong LED 's " LED Good Products" magazine.

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