Rebirth of Northern Technology

After the paper was delivered, Cheng Yongxing stopped optimizing the brightness of the blue LED.

The entire team has entered a renovation period.

The improvement of LED brightness is a cumulative process. Moreover, the brightness of the product in his hand is enough to ensure that the product can be sold.

This is like a CPU upgrade. Toothpaste has to be squeezed little by little to maximize profits.

Like Nakamura, the LED product with a brightness of 2db is released at one time. It's not everyone's job!

This kind of capitalist is not a good capitalist.

But while waiting for the publication of the paper, Cheng Yongxing resumed his normal work and rest system. Sleep at night, go to class or work during the day.

The sophomore course belongs to a transitional period. Some courses are basic courses, such as physics, and some are somewhat related to professional courses. For example, theoretical mechanics.

Due to the lack of homework for almost half a semester, Cheng Yongxing also had to spend some time studying. But after all, with the experience of later generations, the difficulty of picking it up is not too high.

But after class, he did not completely give up technical development. He is now studying while studying and attacking the next mountain.

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The seventh level, white LED.

White light is composed of three primary colors, as everyone knows. So there is no real white LED.

But most of the LEDs we see in the world are white light. For example, the backlight of our mobile phones, the backlight of computers, and LED flashlights.

This involves, in the history of LEDs, another invention patent with a value second only to blue LEDs, that is, white LEDs.

The reason why the industry currently expects blue LEDs is also the hope that the last shortcoming of the three primary colors can be filled. Then, "red light chip + green light chip + blue light chip", we get the final white light.

But after the emergence of blue LEDs, a brand new possibility appeared, that is, the direct conversion from blue light to white light!

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The production principle of this method has existed for a long time in real life. This is the fluorescent lamp.

The light-emitting principle of the fluorescent lamp is to excite mercury atoms to emit ultraviolet rays through electricity, and then the ultraviolet rays are refracted on the phosphor, and then converted into visible light and white light.

Here, a very important keyword appeared, that is, ultraviolet light. In other words, the phosphor can emit white light under the irradiation of ultraviolet rays.

And what is the reason for the low brightness of the blue LED in the first place?

It is because most of the light waves are ultraviolet light!

Therefore, in principle, as long as the blue LED is covered with a layer of phosphor. This is a small fluorescent lamp!

Of course, blue LEDs still have some blue light. If only white phosphors are used, the final result will be blue-white mixed light. Instead of pure white.

Therefore, it is necessary to find phosphors that complement the blue color, that is, yellow phosphors.

This part of the work is actually not technically difficult. Knowing the result to find the answer, things are very simple.

"Yttrium Aluminum Garnet Phosphor" is what Cheng Yongxing is looking for.

In the vicinity of this white LED, a large number of patent clusters have also been formed in later generations. Regarding the types of phosphors, the coating process of phosphors, etc., they have supported a large company.

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Of course, besides looking for yellow phosphor, there is another way to get higher quality white light. That is to eliminate the blue light in the blue LED. Let it only have ultraviolet light!

Ultraviolet LED chip + three primary color phosphors emit light

White LEDs that use this method in later generations are not too few.

However, Cheng Yongxing still doesn't quite understand the second method, nor can he understand how to eliminate blue light. It is easy to adjust the emission wavelength to the direction of visible light, just add impurities.

However, by adjusting the light wave to the ultraviolet direction, he encountered the same problems that everyone encountered when developing blue LEDs. New structures or new materials must be adopted!

This is a bit embarrassing for Cheng Yongxing, the two knives. Therefore, he was slobbering about this patent, but he was powerless.

———————

As his life trajectory normalized, a more serious problem lay before his eyes.

As peers enter the second grade, more and more bold students have joined the ranks of pursuing happiness.

Many of the girls in the Northeast have the character of daring to love and hate. After entering the second grade, these bold girls have courageously pursue their own happiness. Not to mention there are third-grade seniors here, preparing for the old cows to eat tender grass.

As the gold medal winner among the students, Cheng Yongxing's fame followed Hao Yunli's departure, not only did not turn around. Instead, after consolidating at a high level for a period of time, it moved upward again and entered a new upward channel.

The origin of this fame comes with wave after wave of rumors about undergraduates going abroad. As the only undergraduate who can decide the project by himself, his reputation is so high and so good that it is simply unimaginable.

With the popularity of Hong Kong and Taiwan songs, the name "star chaser" began to gain popularity, and Cheng Yongxing slowly began to have his own fans.

Cheng Yongxing's reputation among students shows a trend of polarization. His reputation among the girls is terribly high. Every time I go to the study room, there will be several groups of girls who greet him at the same time.

But on the boy's side, he is the kind of big idiot who has forgotten righteousness and is at the same level as King Shang Zhou.

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As the weather gets colder. Cheng Yongxing's running was forced to stop again. The stadium was transformed into an ice rink.

"Come and help me!"

As soon as Cheng Yongxing put on his skates, he received a signal for help.

The luxury of ice skating is not available in the hometowns of southern students. Every winter, it is the time for these northern children to take revenge. In summer, they were molested by these southern students in swimming lessons.

"Aren't you able to skate by yourself?"

Cheng Yongxing slipped and fell in front of Lin Ting and helped her up.

"It's just that I can stand and walk! I can't talk about sliding!"

"Let's go!"

Cheng Yongxing took Lin Ting's hand and prepared to set off.

"Wait for me, take me one!"

Feng Yan also stretched out his hand behind him.

Although the University of Technology is a northern school, most of the students are from the south. In skating class, the few boys who know how to skate became sweet cakes.

Cheng Yongxing took the hands of the two girls one by one, and gradually slid.

"Xiaocheng, how are you! Be careful, ah!"

But without going far, a white shadow rushed over and knocked all three people down.

If Cheng Yongxing was just alone, he could still escape. But now both hands are being grasped, and there is no way, so I have to bite the bullet and use my body as a pad.

———————

"I'm sorry, I'm sorry! I didn't hold my foot!"

The visitor is actually a girl, and Cheng Yongxing has also seen it as a long-haired female senior in the Department of Electronics.

Cheng Yongxing didn't have much, he just dropped it, his skin was thick and thick, plus the thickness of his clothes, he just got up. But Feng Yan and Lin Ting quit, and they almost didn't quarrel.

There is only one skating rink, and all classes of physical education will be concentrated on this one venue. Around the ice rink, people come and go, and it is very lively.

Cheng Yongxing finally separated the girls and went on the road again, but within ten minutes, he was hit again.

This time, Lin Ting and Feng Yan said they didn't skate together anymore.

The male student next to him has become an out-and-out magnet. There are constantly working outside, and girls from outside majors are moving here.

These girls are not very good at skating. As long as the two sides are close, there is a high probability of a crash. As a result of the greeting, both fell to the ground.

This is the first time that Cheng Yongxing is worried about how handsome he is.

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