Rebirth of Northland Technology

Time has come to the end of October.

The weather is getting cold day by day.It has snowed continuously these days, and soon entered the coldest month.There is a saying in Northeast China that it is not cold when it snows and it is cold when it melts.But now it is cold whether it snows or melts.

The only consolation is that Cheng Yongxing is well prepared this winter.First, the washing machine completely freed him from washing in cold water.Second, the dressing is out of the rustic dress of military coat and cotton jacket.

He has changed into a newly bought down jacket, and the woolen coat can't stand it anymore.

This down jacket has killed him close to 800 oceans.The reason why this dress is so expensive is also related to the place of purchase.He dared not go to the underground shopping mall to buy such expensive clothes.

Slowly, fake goods from the South began to flood, especially the goods sold to Soviet Russia, which were of poor quality.Bingcheng is at a critical point, and the probability of buying fakes is still very high.

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The running is still going on. Due to the change of work and rest time, he is now running two laps after getting up at 9 pm.

As time passed, more and more people knew that Cheng Yongxing did not sleep at night and stayed up late to do experiments.

His tragic color has become more and more intense in the word of mouth.Many people even come over at night to persuade them that they are willing to give up the daytime hours.

But Cheng Yongxing refused on the pretext of wishing to be quiet.In order to avoid these unnecessary harassment, he even changed his work and rest time, delaying the start of evening work from around 8 pm to 10 pm.

Although this will make him lose the time to handover with the LED team, it also invisibly increases his effective working time.

However, this change also made him appear more withdrawn, making his sadness more intense.Various people kept showing up to comfort him, making him dumbfounded.

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The catalyst for development is the arrival of Niu Pin.

Under the pressure of public opinion, Niu Pin had to find his disciples again for the ultimate dialogue.Of course his reason is very valid.This disciple skipped too many lessons!

Cheng Yongxing’s skipping classes this semester has intensified.Especially after the work and rest time is adjusted, there will be less time for class during the day.Of course, because of his special status, the teachers turned a blind eye.But this does not prevent others from using this as a reason to force him to go back to class.

"Please take another week off. I will definitely go back next week!"

Cheng Yongxing gave his promise.The LED experiment has been going on for almost two months, and it's time to finish.

The pressure he is facing is actually increasing.Not only is the pressure of human relations, but also the pressure from the LED team.Rumors of undergraduates selecting outstanding students to go abroad are becoming more and more prosperous, and the group members have also begun to feel impatient.

Whether it is optical fiber or MEMS, it is the first time that there is no result for more than a month.And the group members, after so long herding sheep, everyone searched for the problem on their own, no one followed, and slowly they slack off.

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Level 6, the center of light.

After nearly a month of hard work, InGaNGaN sandwich structure LEDs have been formed on the test bench.In principle, at this point, Cheng Yongxing has become the world's number one in the field of blue LEDs.

But this title is just good-sounding and beautiful.In the field of technology, it is very common for you to catch up with me.

The sample in Cheng Yongxing's hand has a brightness of about 10mcd.Although this brightness has been significantly improved compared with the previous level, it has not yet reached the level that it can be marketed.

Because there are products with similar brightness in the world, they are mainly based on traditional (SiC) technology.In addition, due to the low brightness of LEDs with this brightness, the application scenarios are very narrow, and there is actually not much market.

The current results, published papers, are enough.But it does not have enough commercial value.The next step is to continue to increase the brightness of the blue LED.

Fortunately, the way to increase the brightness is well known, and that is to introduce the luminous center.

Why the brightness of LED samples is very low.The main reason is that the wavelength of light emitted by the LED has entered the ultraviolet field.Now just think of a way to turn it into visible blue light.

The light-emitting center is added as an impurity in the light-emitting layer InGaN.By introducing the luminous center, the wavelength of light emitted is increased.

The result of this approach is immediate.

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On October 26, 1990, the Double Ninth Festival.

Friday at four o'clock in the morning

After four consecutive days of work, the bright blue light finally lit up on the test bench.

With the passage of time, the brightness of LED samples has gradually improved.

As the wavelength of the light wave changes, the brightness of the sample in the visible light domain reaches 5 times that of the previous one, which is 50mdb.

According to the information, when Hero Nakamura reached this step, his brightness was 40mdb.Cheng Yongxing doesn’t know why there are some differences. Maybe it’s because the impurities are different.

If it continues, I believe the brightness of the sample can continue to increase, but Cheng Yongxing is ready to stop there.

It is no longer realistic to increase the brightness by relying solely on his efforts.The brightness improvement of blue LEDs is not just simple doping, it also includes adjustment and optimization of each process in the entire production process, such as the quality of film formation and the quality of crystals.

These all rely on more human and resource input.

Even the hero Nakamura, in the final stage, also introduced a large number of assistants.After seeing hope, Yueya invested a lot of resources.

The project team of Yueya Company expanded rapidly, and it quickly increased to as many as 40 people.Several people are experienced technical backbones in design and manufacturing recruited from large companies.

This is also the essential reason why Yueya pushed the brightness of blue LEDs to 2cd in just a few months.

This is the end of the era of personal heroism.

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In the quiet laboratory, the young man gently took off his mask and stood up.On this silent night, only the moonlight shining through the window was with him.

Although this little blue light is still dim, it lights up the starting point of a great journey.

The road ahead is no longer shrouded in deep thick fog.This light pierced all darkness.

Unfortunately, at this moment of victory, no one shared the joy with him.

The young man raised the tea mug in his hand and raised his cup to the bright moon outside the window.

Invite Mingyue to the movie and raise a glass into three people.

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The lights in the laboratory went out one by one.

When the door was closed, the entire dark space, only the faint blue light, flickered.

Cheng Yongxing walked out of the building.

In the silent night, the bright moonlight is extremely bright under the reflection of the snow.

The young man glanced back at the laboratory window, where it was pitch black.