Another approach is to use materials that emit light.

另外一个途径是利用能发光的物质。

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They emit light which is biased towards the blue end of the spectrum.

它们发射的光偏向色谱的蓝色端。

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This is a major achievement because, in relative terms, planets are very small and do not emit light.

这是一个重要的成就，因为相对来说，行星很小，而且也不发光。

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So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.

如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级，然后它会掉回,到低能级，它就会释放,一个新的波长的光,这个光是可见的。

麻省理工公开课 - 化学原理课程节选

Light-emitting diodes--semiconductors that emit light when electricity passes through them--have been around since the 1960s.

FORBES: Bright, Very Bright

Current Blu-ray lasers emit light in the blue part of the electromagnetic spectrum (about 405 nm wavelength).

FORBES: What is the Future of Optical Disc Technology and who will Use It?

And researchers have even modified plants so that they emit light.

BBC: The light fantastic: Harnessing Nature's glow