CN104198453B - Remote fluorescent powder performance test device and test method - Google Patents
Remote fluorescent powder performance test device and test method Download PDFInfo
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- CN104198453B CN104198453B CN201410468862.7A CN201410468862A CN104198453B CN 104198453 B CN104198453 B CN 104198453B CN 201410468862 A CN201410468862 A CN 201410468862A CN 104198453 B CN104198453 B CN 104198453B
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Abstract
The invention discloses a remote fluorescent powder performance test device and a test method, and relates to fluorescent powder. The remote fluorescent powder performance test device is provided with an integration ball, a cosine collector, a blue light LED (light emitting diode) source, a light reflection cup, a fluorescent powder sheet/silica gel sheet, a TEC (triethyl citrate) temperature control clamp, a constant-current source, a spectrometer, a computer and a base, wherein the integration ball is fixed on the base and is provided with a light inlet and a light outlet; the cosine collector is connected with the spectrometer through an optical fiber at the light outlet and is used for collecting incident light; the output end of the spectrometer is connected with the computer and is used for spectrum collection and data analysis; the blue light LED source is connected with the constant-current source, serves as an exciting light source and is fixed on the TEC temperature control clamp, so that the stability of the light source is guaranteed through temperature control; the light reflection cup is fixed on the blue light LED source and achieves a light focusing effect; the fluorescent powder sheet/silica gel sheet is attached to the light reflection cup; the blue light LED source excites fluorescent powder to generate yellow light, and the yellow light and penetrating blue light are blended to synthesize white light.
Description
Technical field
The present invention relates to fluorescent material, especially relate to a kind of long-distance fluorescent powder performance testing device and method of testing.
Background technology
Energy-conserving and environment-protective are one of themes of New Times development.In illuminating industry, LED as following illumination most important,
Most potential light source, is just widelyd popularize and is developed.LED is all with energy-saving and environmental protection, color diversity and life-span length etc.
Many advantages, have been applied in backlit display screen, street lighting, urban landscape etc. many industry in [S.Pimputkar,
J.S.Speck,S.P.DenBaars,and S.Nakamura,Prospects for LED lighting,Nat.Photon.,
vol.3,no.4,pp.179–181,2009.].White light source based on LED is even more expected to replace tradition in the near future
Electric filament lamp and fluorescent lamp, become following main general illumination light source [M.R.Krames, O.B.Shchekin,
R.Mueller-Mach,G.O.Mueller,L.Zhou,G.Harbers,and M.G.Craford,“Status and
future of high-power light-emitting diodes for solid-state lighting,”
J.Display Technol.3,160–175(2007).].At present, it is primarily present four kinds of techniques to prepare white light LEDs [Yin's length
Peace, Zhao Chengjiu, Liu Xueyan, etc. the luminous journal of the latest developments [J] of white light LEDs, 2000,21 (4)：380.].The first is profit
Obtain white light with after the mixing of red, green, blue three-primary color LED；Second method be by ultraviolet chip excite three primary colors fluorescent powder or
Person excites single-matrix white fluorescent material to obtain white light by ultraviolet-near ultraviolet chip；The third method is to be swashed by blue chip
Jaundice emitting phosphor obtains the white light of blue gold-tinted mixing；4th kind of method is using multiple active layers, so that LED is directly emitted white light,
I.e. MQW method.At present, the third method efficiency high, low cost, is the main method of the industrially prepared white light LEDs of LED, in fact
Now extensive industrialization.
Yellow fluorescent powder is excited to obtain the white light LEDs of blue gold-tinted mixing by blue chip, the performance of fluorescent material is to whole
White light quality has profound influence.Its traditional packaged type of white light LEDs of this method preparation is directly to be applied to fluorescent material
Chip surface, then with point gum machine by transparent epoxy resin point adhesive curing.This method for packing is simple, and low cost, is current main flow
Method for packing.But, because fluorescent material is near chip, when LED normal luminous, the heat of generation can make fluorescent material temperature rise,
So that fluorescent material quantum efficiency reduces, or even affect the luminous efficiency of whole white light.Therefore, current industry has also been proposed one kind
Fluorescent material is away from a kind of packaged type of chip, i.e. long-distance fluorescent powder LED.Its basic structure be blue chip cover one reflective
Cup, adds phosphor material powder layer in reflector.By this packaged type, when eliminating chip light emitting very well, cause phosphor surface
The problem that temperature rises, thus improve the performance of white light LEDs.Fluorescent material performance test be white light LEDs industry one important
Link.For long-distance fluorescent powder performance test, substantially it is placed on platform using by fluorescent material fixation, or combines transparent plastic
Or fluorescent material is prepared into phosphor sheet or thin film by glass plate, then lighted with the blue light source excitated fluorescent powder of a fixation, obtain
Obtain the spectral characteristic of fluorescent material.Said method comes with some shortcomings, and is mainly manifested in：
1st, the excitation source that the method adopts is frequently not the blue-ray LED used by white light LEDs of encapsulation.
2nd, because the light transmission of fluorescent material itself is very poor, when fluorescent material is directly anchored on platform, measure is glimmering
Light powder spectrum is the mixed light that blue light source is radiated at the gold-tinted that the blue light that phosphor surface reflects is excited with blue light.And
White light LEDs are really significant should to be through phosphor powder layer, the luminescent spectrum transmitting.This measuring method can not truly reflect
The characteristic of the long-distance fluorescent powder of encapsulation.
When the 3rd, fluorescent material being prepared into fluorescent powder film with reference to transparent plastic or sheet glass, often do not have when measurement
In view of the impact to printing opacity for the other parts in addition to fluorescent material for the fluorescent powder film, thus it is accurate to affect fluorescent material performance test
Property.
Content of the invention
Present invention aims to the deficiency that above-mentioned prior art exists, provide a kind of long-distance fluorescent powder performance test
Device and method of testing.
Long-distance fluorescent powder performance testing device is provided with integrating sphere, cosine collector, blue light LED light source, reflector, fluorescent material
Piece/silica gel piece, TEC temperature control fixture, constant-current source, spectrogrph, computer and base；Described integrating sphere is fixed on base, integration
Ball is provided with light inlet and light-emitting window, and cosine collector connects spectrogrph by optical fiber at light-emitting window and is used for gathering incident illumination,
The output termination computer of spectrogrph, for spectra collection and data analysiss；Described blue light LED light source is connected with constant-current source, makees
It is fixed on TEC temperature control fixture for excitation source, light source stability is ensured by temperature control；Reflector is fixed on blue light LED light source
On, rise and assemble light action；Phosphor sheet/silica gel piece is attached on reflector, and blue light LED light source excitated fluorescent powder produces gold-tinted, with
Through blue light become white light.
Long-distance fluorescent powder performance test methods, comprise the following steps：
1), after fluorescent material to be measured being mixed with transparent silica gel, it is applied on transparent circular acrylic lucite, then by Asia
Gram force lucite is put into and carries out whirl coating on the adjustable centrifuge of rotating speed, obtains the equally distributed phosphor sheet of thickness, through roasting
After case baking-curing, form the phosphor sheet to be measured of solid-state, in order to eliminate acrylic lucite and the impact to light for the silica gel, use
Identical method, the silica gel piece without fluorescent material for the preparation；
In step 1) in, the temperature of described baking-curing can be 90～110 DEG C, time of baking-curing can for 10～
20min.
2) the reflector blue light LED light source of ining succession that will be seated against phosphor sheet is fixed on the light inlet of integrating sphere it is ensured that blue light
Enter integrating sphere and pass through phosphor sheet, blue light LED light source is fixed on TEC temperature control fixture and is lighted by constant-current source, blue
Light is beaten on phosphor sheet, partly incides integrating sphere through phosphor sheet, and part excitated fluorescent powder is so as to launch gold-tinted portion
Divide and be transmitted in integrating sphere, mixed light passes through cosine collector, through spectrometer collection, and obtains spectrum number by computer disposal
According to, after being measured, phosphor sheet is changed into silica gel piece, and tests under the same conditions, finally take off silica gel piece complete test；
3) pass through to contrast silica gel piece and without the test result under the conditions of silica gel piece, calculate the light transmittance θ of silica gel pieceAbs；
By measuring phosphor sheet gained spectrum, and consider that silica gel piece absorbing light affects, chromaticity coordinates, color rendering index and light can be obtained
Depending on photoelectric parameters such as efficiency；Contrast the spectrum of silica gel piece and phosphor sheet again, acrylic glass plate and silica gel pair can be eliminated
Go out the impact of light, be exactly swashing of corresponding excitated fluorescent powder with the blue light components in silica gel piece blue spectrum button deblooming powder piece spectrum
Luminous, the remaining light of phosphor sheet spectral subtraction blue light components is the emission spectrum of phosphor sheet；Finally, glimmering by being calculated
The light conversion efficiency of light powder and external quantum efficiency.
The present invention has advantages below：
1st, the light source of the present invention adopts blue-ray LED, more conforms to true white light LEDs preparation condition.
2nd, fluorescent material mixed transparent silica gel is prepared into phosphor sheet, by centrifuge whirl coating, ensure that fluorescent material divides
Cloth uniformity reduces phosphor concentration again, so that blue light can with fractional transmission out, the collected white light with measurement is more
Meet the launching light corresponding to industrial white light LEDs.
3rd, pass through silica gel piece and the contrast of phosphor sheet measurement, both eliminate lucite and silica gel itself very well to light
Source sends the impact of light, can separate exciting light and launching light again, obtains the light conversion efficiency of fluorescent material and outer further
Quantum efficiency value.
4th, the present invention can select different light sources, different electric currents, can control the mixed proportion of fluorescent material and silica gel, permissible
Change diameter and the thickness of phosphor sheet.By these variables, can more preferable analysis of fluorescence mealiness energy, be the encapsulation of white light LEDs
Constructive suggestions is provided.
Brief description
Fig. 1 is the structure composition schematic diagram of the long-distance fluorescent powder performance testing device embodiment of the present invention；
Fig. 2 is that under 350mA electric current and blue light excitated fluorescent powder obtains mixed white light to blue-ray LED used by excitated fluorescent powder
Corresponding spectrogram；
Fig. 3 is excitation light spectrogram, wherein a1, and b1, c1, d1, e1, f1, g1 corresponding current is respectively 150mA, 250mA,
350mA, 450mA, 550mA, 650mA, 750mA；
Fig. 4 is emissioning light spectrum figure, wherein a2, and b2, c2, d4, e2, f2, g2 corresponding current is respectively 150mA, 250mA,
350mA, 450mA, 550mA, 650mA, 750mA；
Fig. 5 is fluorescent material light conversion efficiency and current relationship figure；
Fig. 6 is external quantum efficiency of fluorescent powder and current relationship figure.
Specific embodiment
With reference to the accompanying drawings and examples invention is elaborated.
Referring to Fig. 1, long-distance fluorescent powder performance testing device embodiment is provided with integrating sphere 1, cosine collector 2, blue-ray LED light
Source 3, reflector 4, phosphor sheet/silica gel piece 5, TEC temperature control fixture 6, constant-current source 7, spectrogrph 8, computer 9 and base 10；Institute
State integrating sphere 1 to be fixed on base 10, integrating sphere 1 is provided with light inlet and light-emitting window, cosine collector 2 passes through at light-emitting window
Optical fiber connects spectrogrph 8 and is used for gathering incident illumination, the output termination computer 9 of spectrogrph 8, divides for spectra collection and data
Analysis；Described blue light LED light source 3 is connected with constant-current source 7, is fixed on TEC temperature control fixture 6 as excitation source, is protected by temperature control
Card light source stability；Reflector 4 is fixed in blue light LED light source 3, rises and assembles light action；Phosphor sheet/silica gel piece 5 is attached to instead
On light cup 4, blue light LED light source 3 excitated fluorescent powder produces gold-tinted, becomes white light with the blue light passing through.
Long-distance fluorescent powder performance test methods given below：
1), after fluorescent material to be measured being mixed with transparent silica gel, it is applied on transparent circular acrylic lucite, then by Asia
Gram force lucite is put into and carries out whirl coating on the adjustable centrifuge of rotating speed, obtains the equally distributed phosphor sheet of thickness, through roasting
After case baking-curing, form the phosphor sheet to be measured of solid-state, in order to eliminate acrylic lucite and the impact to light for the silica gel, use
Identical method, the silica gel piece without fluorescent material for the preparation；The temperature of described baking-curing can be 90～110 DEG C, baking-curing
Time can be 10～20min；
2) reflector 4 blue light LED light source 3 of ining succession that will be seated against phosphor sheet is fixed on the light inlet of integrating sphere 1 it is ensured that indigo plant
Light enters integrating sphere 1 and passes through phosphor sheet, blue light LED light source 3 is fixed on TEC temperature control fixture 6 and passes through 7 points of constant-current source
Bright, blue light is beaten on phosphor sheet, partly incides integrating sphere 1 through phosphor sheet, and part excitated fluorescent powder is so as to transmitting is yellow
Light is simultaneously partially transmitted in integrating sphere, and mixed light passes through cosine collector 2, gathers through spectrogrph 8, and is processed by computer 9
To spectroscopic data, after being measured, phosphor sheet is changed into silica gel piece, and test under the same conditions, finally take off silica gel piece
Complete to test；
3) pass through to contrast silica gel piece and without the test result under the conditions of silica gel piece, calculate the light transmittance θ of silica gel pieceAbs；
By measuring phosphor sheet gained spectrum, and consider that silica gel piece absorbing light affects, chromaticity coordinates, color rendering index and light can be obtained
Depending on photoelectric parameters such as efficiency；Contrast the spectrum of silica gel piece and phosphor sheet again, acrylic glass plate and silica gel pair can be eliminated
Go out the impact of light, be exactly swashing of corresponding excitated fluorescent powder with the blue light components in silica gel piece blue spectrum button deblooming powder piece spectrum
Luminous, the remaining light of phosphor sheet spectral subtraction blue light components is the emission spectrum of phosphor sheet；Finally, glimmering by being calculated
The light conversion efficiency of light powder and external quantum efficiency.
Present invention introduces photoelectric transformation efficiency and two parameters of external quantum efficiency reflect fluorescent material performance.The light of fluorescent material
Photoelectric transformation efficiency ηERefer to fluorescent material under the incident illumination of certain wavelength excites, the energy φ of launching lightE launches(or luminous power) and its
The energy φ of the exciting light being excitedE excitesThe ratio of (or luminous power), that is,：
Wherein, λemAnd λexRepresent wavelength of transmitted light and excitation wavelength, φ respectivelyem(λem) and φex(λex) represent respectively
Launching light and the function of spectral power distribution of exciting light, (λ1, λ2) and (λ '1, λ '2) it is respectively launching light and exciting light spectrum ripple
Long distribution.Notice θ in formulaAbsConsider silica gel and the impact of lucite extinction in long-distance fluorescent powder, but due to θAbs
Whole visible spectrum respond relatively flat, above formula can be reduced to：
External quantum efficiency η of fluorescent materialQRefer to fluorescent material under the incident illumination of certain wavelength excites, the number of photons of launching light
NTransmittingWith exciting light subnumber NExciteRatio, that is,：
Wherein, h and c represents pula gram constant and light velocity value respectively.
In the particular embodiment：
(1) selected by, transparent acrylic lucite piece diameter is respectively 25mm, 30mm, 35mm；Fluorescent material and the matter of silica gel
Amount ratio respectively 1: 1,1: 2；
(2) blue-ray LED passes through TEC temperature control fixture temperature control at 25 DEG C, and constant-current source current value is respectively 150mA, 250mA,
350mA,450mA,550mA,650mA,750mA.
Under 350mA electric current and blue light excitated fluorescent powder obtains mixed white light and corresponds to blue-ray LED used by excitated fluorescent powder
Spectrogram referring to Fig. 2, referring to Fig. 3, emissioning light spectrum figure is referring to Fig. 4 for excitation light spectrogram.Shown in Fig. 5 and Fig. 6 is to be based on
Transparent acrylic glass diameter is 30mm, and fluorescent material and silica gel mass ratio are 1: 1, and the light conversion efficiency of fluorescent material and outer quantum are imitated
Rate and the graph of a relation of electric current.From Fig. 5 and 6, light conversion efficiency substantially remains between 52%～54%, external quantum efficiency base
Originally it is maintained between 67%～69%.Additionally, comparing under different-diameter and fluorescent material and the mass ratio of silica gel by experiment, glimmering
Meansigma methodss under different electric currents for the light conversion efficiency value and external quantum efficiency of light powder are respectively as shown in Tables 1 and 2.
Table 1
Table 2
Analyze Tables 1 and 2 and combine knowable to Fig. 5 and Fig. 6 data, different electric currents, diameter, under fluorescent material and silica gel proportioning
Fluorescent material light conversion efficiency value deviation 5% within, external quantum efficiency of fluorescent powder value deviation is also within 5%, and error belongs to
It was demonstrated that the feasibility of this measuring method and stability in experiment tolerance interval.
Claims (2)
1. a kind of long-distance fluorescent powder performance test methods are it is characterised in that adopting long-distance fluorescent powder performance testing device, described remote
Journey fluorescent material performance testing device be provided with integrating sphere, cosine collector, blue light LED light source, reflector, phosphor sheet/silica gel piece,
TEC temperature control fixture, constant-current source, spectrogrph, computer and base；Described integrating sphere is fixed on base, integrating sphere be provided with into
Optical port and light-emitting window, cosine collector connects spectrogrph by optical fiber at light-emitting window and is used for gathering incident illumination, spectrogrph defeated
Go out to terminate computer, for spectra collection and data analysiss；Described blue light LED light source is connected with constant-current source, as excitation source
It is fixed on TEC temperature control fixture, light source stability is ensured by temperature control；Reflector is fixed in blue light LED light source, rises and assembles light
Effect；Phosphor sheet/silica gel piece is attached on reflector, and blue light LED light source excitated fluorescent powder produces gold-tinted, mixes with the blue light passing through
Synthesis white light；
The method comprising the steps of：
1), after fluorescent material to be measured being mixed with transparent silica gel, it is applied on transparent circular acrylic lucite, then by acrylic
Lucite is put into and carries out whirl coating on the adjustable centrifuge of rotating speed, obtains the equally distributed phosphor sheet of thickness, dries through baking box
After roasting solidification, form the phosphor sheet to be measured of solid-state, in order to eliminate acrylic lucite and the impact to light for the silica gel, with identical
Method, preparation without fluorescent material silica gel piece；
2) will be seated against phosphor sheet reflector in succession blue light LED light source be fixed on integrating sphere light inlet it is ensured that blue light enter
Integrating sphere simultaneously passes through phosphor sheet, blue light LED light source is fixed on TEC temperature control fixture and is lighted by constant-current source, blue light is beaten
On phosphor sheet, partly incide integrating sphere through phosphor sheet, part excitated fluorescent powder is so as to transmitting gold-tinted partly saturating
It is mapped in integrating sphere, mixed light passes through cosine collector, through spectrometer collection, and obtains spectroscopic data by computer disposal, survey
After the completion of amount, phosphor sheet is changed into silica gel piece, and test under the same conditions, finally take off silica gel piece and complete to test；
3) pass through to contrast silica gel piece and without the test result under the conditions of silica gel piece, calculate the light transmittance θ of silica gel pieceAbs；Pass through
Measurement phosphor sheet gained spectrum, and consider that silica gel piece absorbing light affects, obtain photoelectric parameter；Contrast silica gel piece and fluorescent material again
The spectrum of piece, eliminates acrylic glass plate and silica gel to the impact going out light, with silica gel piece blue spectrum button deblooming powder piece light
Blue light components in spectrum are exactly the exciting light of corresponding excitated fluorescent powder, and the remaining light of phosphor sheet spectral subtraction blue light components is glimmering
The emission spectrum of light powder piece；Finally, by being calculated light conversion efficiency and the external quantum efficiency of fluorescent material, described photoelectricity ginseng
Number includes chromaticity coordinates, color rendering index and luminous efficacy.
2. as claimed in claim 1 a kind of long-distance fluorescent powder performance test methods it is characterised in that in step 1) in, described baking
The temperature of solidification is 90～110 DEG C, and the time of baking-curing is 10～20min.
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| CN110658169B (en) * | 2019-10-14 | 2021-05-14 | 厦门大学 | Hyperspectrum-based transmission-type testing device and method for luminescent characteristics of fluorescent powder |
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| DE102010016801A1 (en) * | 2010-05-05 | 2011-11-10 | Technische Universität Graz | Fluorescence detection device for high performance liquid chromatography device, has evaluation unit determining lifetime of excited state of analytes by pulsed time-correlated individual photon count or by modulation fluorometry |
| CN101825571A (en) * | 2010-05-18 | 2010-09-08 | 中国计量学院 | Integrating sphere type fluorescence detection device based on LED light source |
| CN202004043U (en) * | 2010-09-09 | 2011-10-05 | 张涛 | Patch-type white light LED device |
| CN102767725A (en) * | 2012-07-30 | 2012-11-07 | 轻工业部南京电光源材料科学研究所 | Bulb lamp based on remote fluorescent light source module |
| CN103308499B (en) * | 2013-05-24 | 2016-07-06 | 厦门大学 | A kind of blue-ray LED excitated fluorescent powder performance testing device and method of testing |
| CN103604789B (en) * | 2013-11-25 | 2016-04-06 | 南京信息职业技术学院 | A kind of fluorescent powder Performance Test System and method of testing |
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