CN102382648B - Method for enhancing photosynthesis spectral intensity of LED phosphor by using plasma - Google Patents
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- 230000029553 photosynthesis Effects 0.000 title claims abstract description 22
- 238000010672 photosynthesis Methods 0.000 title claims abstract description 22
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 17
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003595 spectral effect Effects 0.000 title claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 238000004544 sputter deposition Methods 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 11
- 239000011521 glass Substances 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims abstract description 7
- 239000002120 nanofilm Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 229910052709 silver Inorganic materials 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 14
- 239000010408 film Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000004020 luminiscence type Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 4
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 4
- 229910017639 MgSi Inorganic materials 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- -1 rare-earth ion activated magnesium silicate Chemical class 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 125000003158 alcohol group Chemical group 0.000 claims description 2
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- 238000000576 coating method Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 2
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 18
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Abstract
A method for enhancing photosynthesis spectral intensity of an LED phosphor by using plasma is realized by employing metal surface plasma effect. A light source emitting blue-violet light is employed, and blue-violet light irradiates on a metal film to generate surface plasma effect, which interacts with emit photons of the phosphor, so that intensity of photosynthesis spectrum emitted by the phosphor is enhanced. The method comprises the following steps: 1) placing a glass substrate in a sputtering cavity, carrying out sputtering deposit on a metal target, and carrying out heat treatment in nitrogen to prepare an insular metal nano film; 2) dispersing the LED phosphor in a dispersing agent to form a phosphor solution, coating the phosphor solution on the glass substrate with the metal nano film prepared on by spin coating and obtaining a phosphor / Ag chemiluminescence system. The invention has advantages of simple technology, low cost, simultaneous increase of red and blue light and illuminating enhancement proportion controlled by metal sputtering time, and is easy for practice and beneficial for popularization and application.
Description
[technical field]
The present invention relates to photoelectric material and devices field, particularly a kind of method with enhancing photosynthesis spectral intensity of LED phosphor by using plasma.
[background technology]
It is more luxuriant that plant needs all that the irradiation of sunlight could grow.The different wave length line is different for the impact of photosynthesis of plant, and the wavelength of light that photosynthesis of plant needs is about 400-700nm.400-500nm (blue light) and 610-720nm (ruddiness) are maximum for the photosynthesis contribution, are called photosynthesis spectrum.Since blue light diode chip invention, the plant-growth solid state light emitter that becomes array combination with blue light with red-light LED is all having very large superiority than conventional fluorescent aspect energy-conservation, work-ing life and the compact type volume structure.Yet also exist problem simultaneously, present commercial red-light LED wavelength region is in 580 nanometer to 610 nanometer range, in fact not in spectral range is used in the characteristic light cooperation; Adopt blue-ray LED excitation rare-earth purity nitrogen compound to produce the scheme of photosynthesis spectrum, because the red emitting material preparation cost is high, be difficult to large-scale application; The fluor of solid-state diode encapsulation usefulness is not single matrix but mixes powder, when using high-power chip as structural unit, will run into the inhomogeneity obstacle of blend of colors, and existing color to absorb again and proportioning regulation and control problem between the order powder mix, luminous efficiency is greatly affected.And the rare-earth ion activated magnesium silicate luminescent material that contains of single matrix of our preparation can cover indigo plant, ruddiness zone to the photosynthesis of plant important in inhibiting just.Although its efficient is very high, energy-efficient LED is the target that people pursue always, so people have adopted the whole bag of tricks to strengthen light-emitting phosphor intensity.And the research of metal surface plasma body enhancement effect of fluorescence is the research field of the new rise of last decade, when hertzian wave is propagated abreast along a direction on metal and dielectric medium interface, the unbound electron of metallic surface regular motion and produce surface plasma body resonant vibration under the external electromagnetic field action of certain frequency, this resonance can greatly strengthen the electromagnetic field around the metallics, the enhancing of this surperficial local electromagnetic field improves the launching efficiency near the luminescence center of metallic surface, causes the generation of enhancement effect of fluorescence.In recent years, people have begun to attempt utilizing this method to strengthen semiconductor material and device luminous efficiency.Therefore the surface plasma enhancement effect of fluorescence has brought opportunity for the research of the luminous intensity of enhancing fluor (powder, film and body material), has also expanded the range of application of metal-enhanced fluorescence effect.
[summary of the invention]
The objective of the invention is for above-mentioned technical Analysis, a kind of method with enhancing photosynthesis spectral intensity of LED phosphor by using plasma is provided, technique of the present invention is simple, with low cost, can strengthen simultaneously the two light of red indigo plant of this fluor, and luminous enhancing ratio can be controlled by the sputtering time of metal; Easy to implement and with low cost, be conducive to apply.
Technical scheme of the present invention:
A kind of method with enhancing photosynthesis spectral intensity of LED phosphor by using plasma improves the method for LED fluor photosynthesis spectral intensity for adopting the metal surface plasma Body Effect.
Described employing metal surface plasma Body Effect improves the method for LED fluor photosynthesis spectral intensity, adopt the light source of emission royal purple light, royal purple photoirradiation metallic film produces the surface plasma Body Effect, interact with the emission photon of fluor, the photosynthesis spectral intensity of fluor emission is strengthened, and concrete steps are as follows:
1) substrate of glass is put into sputtering chamber, the chamber internal gas pressure is less than 2Pa, passing into argon gas is shielding gas, air-flow is 2.5l/min, pass into argon gas back cavity internal gas pressure and maintain 2.8Pa, metal targets is carried out sputtering sedimentation, sputtering current is that 4mA, sputtering time are 20-200s, then in being 99.99% nitrogen atmosphere, purity heat-treats, can make the metal nanometer thin film of island, thermal treatment temp is that 100-300 ℃, heat treatment time are 10-30mins, and the thickness of metal nanometer thin film is 12-80nm;
2) the LED fluor is dispersed in forms fluorescent solution in the dispersion agent, after ultrasonic half an hour this fluorescent solution is spin-coated on the above-mentioned substrate of glass for preparing the metal nano film that places on the sol evenning machine, the sol evenning machine rotating speed is 1400 rev/mins, be 20-60s runtime, can make the luminescence system of fluor/Ag.
Described metal targets is that purity is 99.99% Ag target.
Described LED fluor is the rare-earth ion activated magnesium silicate luminescent material that contains, and its chemical formula is Ba
3MgSi
2O
8: Eu
2+, Mn
2+(BMS-EM), this fluorescence physical efficiency utilizing emitted light cooperation photon, the characteristic peaks wavelength that comprises in the photosynthesis spectrum of formation is the blue light of 440-460nm and the ruddiness of 610-660nm.
Described dispersion agent is alcohol or polymethylmethacrylate (PMMA), and the amount ratio of LED fluor and dispersion agent is 0.1g/10ml.
Analysis on Mechanism of the present invention: under the exciting of light source, the Eu of excited state
2+Ion and silver-colored island film have formed local surface plasma under the interaction near field.When the emission peak of the resonance peak of metal local surface plasma and fluor was complementary, the surface plasma body resonant vibration coupling will occur.This resonance can greatly strengthen the electromagnetic field around the metallics, so that Eu
2+Launching efficiency improve, and then so that 4f
65d
1→ 4f
7Radiative transistion probability increase.And red emission is to pass through Eu
2+The resonant energy with no radiation transmission at blue light emitting center impel 4T
1→ 6A
1The transition emission so the enhancing of the photon energy of blue light has also impelled the luminous intensity of ruddiness to strengthen to some extent, has finally caused the enhancing of the two light of red indigo plant.
Advantage of the present invention is: technique of the present invention is simple, with low cost, the luminescence system of the method preparation can be so that the luminous intensity of fluor strengthens, and the two light of the red indigo plant that can strengthen simultaneously this fluor, the intensity of blue light and ruddiness can increase respectively 1.5 times, 1.45 doubly, luminous enhancing ratio can be controlled by the sputtering time of metal simultaneously; Easy to implement and with low cost, be conducive to apply.
[description of drawings]
Fig. 1 is the structure of this luminescence system, the synoptic diagram that excites and survey.
Fig. 2 is the abosrption spectrogram of island silver nanoparticle film of different thickness and the utilizing emitted light spectrogram that 350nm excites lower fluor.
Fig. 3 is the utilizing emitted light spectrogram that 350nm excites the fluor of lower island silver nanoparticle membrane interaction front and back.
Fig. 4 is the enhancing scale map of the Red and blue light under the different thickness island silver nanoparticle membrane interaction.
[embodiment]
Further specify the present invention below in conjunction with accompanying drawing.With reference to Fig. 1, whole luminescence system comprises substrate of glass, Nano silver grain and three parts of luminescent coating from bottom to top.
Embodiment 1:
A kind of method with enhancing photosynthesis spectral intensity of LED phosphor by using plasma adopts the metal surface plasma Body Effect to improve LED fluor photosynthesis spectral intensity, and step is as follows:
1) substrate of glass is put into sputtering chamber, the chamber internal gas pressure is evacuated to below the 2Pa, and this moment, to pass into argon gas be shielding gas, and air-flow is 2.5l/min, and the chamber internal gas pressure maintains 2.8Pa, take the silver of purity as 99.99% as target as sputter, carries out sputtering sedimentation.Sputtering current is 4mA, and sputtering time is elected 40s as, and silver film thickness is 12nm, obtains the silver nanoparticle film of island after heat-treating in purity is 99.99% nitrogen atmosphere afterwards, and thermal treatment temp is that 200 ℃, time are 21mins;
2) with Ba
3MgSi
2O
8: Eu
2+, Mn
2+Be dispersed among alcohol or the PMMA, ultrasonic half an hour, the substrate of glass that prepares the silver nanoparticle film be placed on the sol evenning machine, get the above-mentioned fluorescent material solution for preparing and carry out spin coating, the sol evenning machine rotating speed is 1400 to turn/min, and be 30s runtime, can make the luminescence system of fluor/Ag.
Embodiment 2:
Step is with embodiment 1, and difference is that sputtering time is 60s, and silver film thickness is 20nm.
Embodiment 3:
Step is with embodiment 1, and difference is that sputtering time is 90s, and silver film thickness is 50nm.
Embodiment 4:
Step is with embodiment 1, and difference is that sputtering time is 120s, and silver film thickness is 65nm.
Embodiment 5:
Step is with embodiment 1, and difference is that sputtering time is 160s, and silver film thickness is 80nm.
Fig. 2 has provided the abosrption spectrogram of island silver nanoparticle film of different thickness and the utilizing emitted light spectrogram that 350nm excites lower fluor.It has illustrated the relation between silver-colored absorption spectrum and the fluorescent material emmission spectrum.
Fig. 3 has provided 350nm and has excited the emmission spectrum of the fluorescent material before and after the membrane interaction of lower silver-colored island and the enhancing scale map of the Red and blue light under the membrane interaction of different thickness silver island.As seen from the figure, silver nanoparticle thickness arrives in the 80nm scope 12, and after the thermal treatment, under 50nm silver nanoparticle membrane interaction, the intensity of blue light strengthens 1.5 times at most, 1.45 times of the intensity enhancing of ruddiness.Illustrate that the emission peak that only has when resonance peak (namely absorbing peak position) and the fluorescent material of the LSP of silver is complementary and the size of silver nano-grain when relatively large, the emissive porwer of fluorescent material is strengthened.
Claims (1)
1. method with enhancing photosynthesis spectral intensity of LED phosphor by using plasma, it is characterized in that: the light source that adopts emission royal purple light, royal purple photoirradiation metallic film produces the surface plasma Body Effect, interact with the emission photon of fluor, the photosynthesis spectral intensity of fluor emission is strengthened, and concrete steps are as follows:
1) substrate of glass is put into sputtering chamber, the chamber internal gas pressure is less than 2 Pa, passing into argon gas is shielding gas, air-flow is 2.5 l/min, pass into argon gas back cavity internal gas pressure and maintain 2.8 Pa, be that 99.99% Ag target carries out sputtering sedimentation to purity, sputtering current is that 4 mA, sputtering time are 20-200 s, then in being 99.99% nitrogen atmosphere, purity heat-treats, can make the metal nanometer thin film of island, thermal treatment temp is that 100-300 ℃, heat treatment time are 10-30 mins, and the thickness of metal nanometer thin film is 12-80 nm;
2) the LED fluor is dispersed in forms fluorescent solution in the dispersion agent, after ultrasonic half an hour this fluorescent solution is spin-coated on the above-mentioned substrate of glass for preparing the metal nano film that places on the sol evenning machine, the sol evenning machine rotating speed is 1400 rev/mins, be 20-60 s runtime, can make the luminescence system of fluor/Ag, described LED fluor is the rare-earth ion activated magnesium silicate luminescent material that contains, and its chemical formula is Ba
3MgSi
2O
8: Eu
2+, Mn
2+This fluorescence physical efficiency utilizing emitted light cooperation photon, the characteristic peaks wavelength that comprises in the photosynthesis spectrum that consists of is the blue light of 440-460 nm and the ruddiness of 610-660 nm, and described dispersion agent is alcohol or polymethylmethacrylate, and the amount ratio of LED fluor and dispersion agent is 0.1g/10ml.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102679242A (en) * | 2012-04-27 | 2012-09-19 | 上海合鸣照明电器有限公司 | Pure three-color fluorescent powder plant illumination supplement lamp and manufacturing method thereof |
| CN103280506B (en) * | 2013-05-16 | 2016-09-07 | 邯郸市盛德技术玻璃有限公司 | Artificial royal purple light type photosynthetic light conversion glass planar light source |
| CN103489998B (en) * | 2013-10-15 | 2017-01-18 | 四川柏狮光电技术有限公司 | Light-emitting assembly and manufacturing method thereof, as well as LED (light-emitting diode) lighting device with light-emitting assembly |
| CN103666475A (en) * | 2013-12-11 | 2014-03-26 | 昆明理工大学 | Rare earth doped glass frequency conversion luminous material and preparation method thereof |
| CN104264117A (en) * | 2014-09-25 | 2015-01-07 | 盐城工学院 | Simple and convenient method of luminescence intensity of Ag nano particle enhanced organic composite fluorescence material |
| CN105203511A (en) * | 2015-09-14 | 2015-12-30 | 东南大学 | Preparation method of substrate with fluorescence enhancement effect |
| EP3612813A4 (en) * | 2017-04-18 | 2020-04-15 | Okinawa Institute of Science and Technology School Corporation | Nanoplasmonic instrumentation, materials, methods and system integration |
| US11578839B2 (en) | 2019-08-07 | 2023-02-14 | Seoul Viosys Co., Ltd. | Light source unit for plant cultivation and plant cultivation assembly having the same |
| US11578840B2 (en) | 2020-03-10 | 2023-02-14 | Seoul Viosys Co., Ltd. | Light source module for plant cultivation and light irradiation device including the same |
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| CN1927995A (en) * | 2005-09-07 | 2007-03-14 | 佳能株式会社 | Luminescent materials, luminescent body, display device and method for manufacturing luminescent body |
| CN102154010A (en) * | 2011-01-29 | 2011-08-17 | 陈哲艮 | Photo-enhancement photoluminescence material as well as preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1927995A (en) * | 2005-09-07 | 2007-03-14 | 佳能株式会社 | Luminescent materials, luminescent body, display device and method for manufacturing luminescent body |
| CN102154010A (en) * | 2011-01-29 | 2011-08-17 | 陈哲艮 | Photo-enhancement photoluminescence material as well as preparation method and application thereof |
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| Title |
|---|
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| Seong Min Lee et al.Enhanced emission from BaMgAl10O17Eu2+ by localized surface plasmon resonance of silver particles.《OPTICS EXPRESS》.2010,第18卷(第12期),第12144－12152页. |
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