ＬＥＤ照明のナゾ／The Mystery of LEDs
25.9 هزار بار بازدید -
2 سال پیش
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DENJIRO: Take a look at
DENJIRO: Take a look at these LEDs. If we zoom in on one, we see that there are LEDs of three colors: red, green, and blue.
NARRATOR: The color white is made by turning on all three of these colors at the same time.
DENJIRO: Now, let’s look inside another white LED light bulb. There is a yellow fluorescent substance painted on the LEDs. Actually, only blue LEDs are used in this light bulb.
So how does this work? Let’s perform an experiment. I have a yellow fluorescent substance painted on some tracing paper. Let me put this over a blue LED. Watch what happens.
BOY: The light is white!
DENJIRO: The blue LED light passes through the yellow fluorescent substance and emits a white light. Blue is able to create a color that red and green LEDs can’t. This is a white piece of paper with “Happy Energy” spelled out using pushpins. The part of the pushpins that you hold is the fluorescent substance. Let me shine a red LED on this. You can’t really make out the letters. Now, let’s try a green LED. You would think the pushpins would all be green, but some are red. So how about with a blue LED? Both the green and red are shining clearly, and you can see the letters. Only the blue LED is able to make both red and green shine. A fluorescent substance emits light with a long wavelength when light with a short wavelength hits it. A white LED creates white light by using a short-wavelength blue LED to make a yellow fluorescent substance shine.
Compared to previous light sources, the white LEDs are very energy efficient. This incandescent light bulb uses 100 W of electricity. On the other hand, it takes about seven white LEDs to use 100 W of electricity. That means you can light up seven light bulbs with the same amount of electricity. Look at how much light you can obtain with LEDs.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
NARRATOR: The color white is made by turning on all three of these colors at the same time.
DENJIRO: Now, let’s look inside another white LED light bulb. There is a yellow fluorescent substance painted on the LEDs. Actually, only blue LEDs are used in this light bulb.
So how does this work? Let’s perform an experiment. I have a yellow fluorescent substance painted on some tracing paper. Let me put this over a blue LED. Watch what happens.
BOY: The light is white!
DENJIRO: The blue LED light passes through the yellow fluorescent substance and emits a white light. Blue is able to create a color that red and green LEDs can’t. This is a white piece of paper with “Happy Energy” spelled out using pushpins. The part of the pushpins that you hold is the fluorescent substance. Let me shine a red LED on this. You can’t really make out the letters. Now, let’s try a green LED. You would think the pushpins would all be green, but some are red. So how about with a blue LED? Both the green and red are shining clearly, and you can see the letters. Only the blue LED is able to make both red and green shine. A fluorescent substance emits light with a long wavelength when light with a short wavelength hits it. A white LED creates white light by using a short-wavelength blue LED to make a yellow fluorescent substance shine.
Compared to previous light sources, the white LEDs are very energy efficient. This incandescent light bulb uses 100 W of electricity. On the other hand, it takes about seven white LEDs to use 100 W of electricity. That means you can light up seven light bulbs with the same amount of electricity. Look at how much light you can obtain with LEDs.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!”
2 سال پیش
در تاریخ 1401/10/23 منتشر شده
است.
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