The cost is not the stumbling block of semiconductor white light lighting

Although semiconductor lighting is very expensive, it is difficult to enter the ordinary consumer family that can be heard without end but the semiconductor white light lighting lamp, to replace the incandescent lamp and fluorescent lamp, in epitaxy, chip and package and cost reduction is not difficult, the key challenge is to can greatly enhance the technical level. It is an inevitable trend to replace the incandescent lamp and fluorescent lamp with the semiconductor lighting.

Semiconductor lighting costs have been declining

The technical route semiconductor lighting many different technologies in different cost. On the same technical route, there are significant differences in the cost of different technical levels. Even if the same technical route, the same level of technology, the manufacturers use different cost control methods, the results will be much different. Due to the above problems are difficult to predict the cost, so the cost of semiconductor lighting to do the forecast, let us make some assumptions about the technical program:

First, blue LED fluorescence powder, the blue LED GaN multiple quantum well structure LED. Secondly, by the size of 1mm * 1mm chip package into a single lamp. Third, the semiconductor lighting lamp is composed of a plurality of single lamps. Fourth, every single lamp are installed on the lamp bracket with driving power supply, good thermal performance, but the driving power supply, support and decoration parts cost is not included in the solid state lighting costs, that we only consider the "bulb" cost. Fifth, the chip luminous efficiency and the size of the chip can withstand the power density is basically irrelevant to the cost. This assumption is clearly inadequate, but due to technical route for increasing the power density of luminous efficiency and the device can bear too much, it is difficult to predict the true cost of different routes, so in the current situation to the case. However, this assumption is within a certain range. For example, the same research units or enterprises to improve the epitaxial growth, chip manufacturing and packaging, often can not significantly increase the cost of the premise, through the optimization of the technology and the current density significantly improve the luminous efficiency and the device can bear. Sixth, epitaxial growth, chip manufacturing and device packaging are to achieve an ideal pass rate of 90%.

Some countries have to, solid-state lighting technology cost to make a plan, for example, the solid-state lighting technology roadmap is on the target cost:

First, to 2007, the luminous flux is 200lm (solid state white lighting efficiency is 75lm/W), the price dropped below $4, which is equivalent to 20W incandescent lamp level solid white light illuminating light flux, the price down to 32 yuan.

Second, to 2012, the luminous flux is 1000lm (solid state white lighting luminous efficiency is 150lm/W), the price dropped below $5, which is equivalent to 60W incandescent lamp level solid white light illuminating light flux, the price down to 40 yuan.

Third, to 2020, the luminous flux is 1500lm (solid state white lighting luminous efficiency is 200lm/W), the price dropped below $3, which is equivalent to 20W fluorescent lamp level solid white light illuminating light flux, the price dropped to 24 yuan.

In addition to the cost of planning, how to market the current situation?

Currently on the market for solid flux white single lamp 30lm ~ 50lm (1mm * 1mm chip), the sales price of about 20 yuan to 28 yuan. But what about the actual cost? In a diameter of sapphire substrate 50mm, GaN based LED substrate epitaxy and chip costs were 300 yuan, 300 yuan and 600 yuan, the epitaxial material can be manufactured into 1600 size power semiconductor chip 1mm * 1mm, each chip costs less than 1 yuan.

Package 1W semiconductor light cost about 6 yuan (excluding chip cost), but the mass production, manufacturers own mould, cost control in 1.5 yuan is not a problem, so, as long as the enterprises make up the scale, the qualified rate to reach the anticipated goal, 1W semiconductor light cost to be less than 2.5 yuan. Improving the luminous efficiency is the key to reduce the cost

Luminous efficiency is 40lm/W, 1W semiconductor light cost less than 2.5 yuan, the flux for semiconductor white light lighting lamp 1500lm, the cost should be controlled in less than 93.75 yuan.

Luminous efficiency is 200lm/W, 1W semiconductor light cost less than 2.5 yuan, the flux for semiconductor white light lighting lamp 1500lm, the cost should be controlled in less than 18.75 yuan.

Luminous efficiency is as high as 200lm/W, while the device power density is up to 10W/mm2, is the highest goal of the solid state lighting technology roadmap. If this goal can be achieved, that is, the use of a 1mm x 1mm GaN based LED chip, can be packaged into a luminous flux of 2000lm semiconductor white light, which is brighter than the 20W fluorescent lamp. At this point, compared to fluorescent lamps, 1500lm semiconductor white light lower cost, the cost of the main body depends on the package, the cost may be less than 5 yuan. This goal can be achieved, epitaxial material growth, chip manufacturing and device packaging is equally important.

The research work shows that, semiconductor lighting chip under power density 10W/mm2 is no problem, as long as the radiation condition is good enough, and the key to the future is to improve the internal quantum efficiency of epitaxial material, improve the optical efficiency of the chip, improve the characteristics of encapsulation efficiency and heat dissipation. Semiconductor white light lighting lamp to replace the incandescent lamp and fluorescent lamp, in epitaxy, chip and package cost is not very difficult, some documents and reports as said so terrible, even if the forecast cost doubled