Structure for enhancing and directionally transmitting luminescence of luminescent material

Abstract

The invention discloses a structure for enhancing and directionally transmitting the luminescence of a luminescent material, which can enable the luminescent material to achieve the effects of enhancement and directional transmission. The invention has the technical scheme that the structure comprises a flat metal substrate and a periodic single-layer colloid ball covering the flat metal substrate.

Description

technical field [0001] The present invention relates to a structure for emitting the light emitted by luminescent substances, in particular to a structure for enhancing and directional emitting the light emitted by luminescent substances. Background technique [0002] Luminescent substances have been widely used in the fields of lighting, detection and marking, but the effective use of luminescent substances is still the direction of people's efforts today. The main reasons for the low overall luminous efficiency of luminescent substances are as follows. First: When incident light or pump light excites the luminescent substance, most of the pump light is not absorbed by the luminescent substance, but reflected and transmitted. Second: The luminescence of luminescent substances has the property of isotropic luminescence, and in many cases we can only use the light emitted by the luminescence in a certain direction, so the collected luminescence energy only accounts for a sma...

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Problems solved by technology

Third: For luminescent substances dispersed in high refractive index materials or materials with high refractive index themselves, such as LEDs, etc., most of the light emitted by them cannot be emitted into the air due to total reflection in the medium and air layer, which eventually leads to waste of energy

However, only using flat metals to achieve fluorescence enhancement has its own limitations. This is mainly due to the fact that electromagnetic waves in free space cannot be directly coupled with surface plasmon modes. One of the methods to solve this problem is the prism coupling method, but this method has It is difficult to integrate, and the adjustable range of emission angle and incidence angle is small.

In 1998, T.W.Ebbesen successfully coupled free-space light waves into surface plasmon modes using a metal grating structure, and then a Canadian chemical working group published an article on J.Am.Chem.Soc. Using a metal grating structure to achieve Enhanced emission of fluorescence, but this method has the disadvantages of difficult processing and large dissipation

Some other working groups use the surface plasmon resonance of metal nanoparticles to achieve luminescence enhancement, but they also have the disadvantages of large dissipation and incapable of directional emission, etc.

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