CN107228710A - A kind of quantum efficiency of LED measurement apparatus and its measuring method - Google Patents
A kind of quantum efficiency of LED measurement apparatus and its measuring method Download PDFInfo
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- CN107228710A CN107228710A CN201710383842.3A CN201710383842A CN107228710A CN 107228710 A CN107228710 A CN 107228710A CN 201710383842 A CN201710383842 A CN 201710383842A CN 107228710 A CN107228710 A CN 107228710A
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
- G01J5/22—Electrical features thereof
Abstract
A kind of quantum efficiency of LED measurement apparatus and its measuring method, are related to light emitting diode.Device is provided with computer, digital power table, temperature control source table, temperature control fixture, spectrometer and thermal infrared imager.Measuring method：Using quantum efficiency of LED measurement apparatus；One group of temperature value T is set by temperature control source table, one group of temperature value of setting comprises at least 5 different temperature value T；Different temperature control fixture temperature value T are obtained by temperature value and current value measurementSUnder light emitting diode one group of quantum efficiency η；By one group of measured quantum efficiency η, the graph of a relation of quantum efficiency η and temperature T under the conditions of different current value I is first drawn；Quantum efficiency (η ') in the case of elimination heat affecting is obtained by formula.
Description
Technical field
The present invention relates to light emitting diode, more particularly, to a kind of quantum efficiency of LED measurement apparatus and its measurement
Method.
Background technology
In the past few years, light emitting diode (LED) technology is developed rapidly, and is widely used in backlight, friendship
The field such as ventilating signal lamp and general illumination ([1] Z.Q.Liu, T.B.Wei, E.Q.Guo, X.Y.Yi, L.C.Wang, J.X.Wang,
G.H.Wang,Y.Shi,I.Ferguson and J.M.Li,Appl.Phys.Lett.99,091104(2011)；[2]
M.E.Raypah,B.K.Sodipo,M.Devarajan,and F.Sulaiman,IEEE Trans.Electron Devices,
63,2790-2795,(2016)).When being worked due to semiconductor devices, particularly power semiconductor, it can produce substantial amounts of
Heat, causes the temperature at LED P N knots to raise, and PN junction temperature, which rises, to cause light-emitting diode luminous efficiency to decline.It is accurate
The quantum efficiency during work of LED device constant temperature is really measured, on the one hand can be with the quality of materials and device of analysis device
Internal structure, be on the other hand also practical application design in an important parameter.Constant temperature lower semiconductor quantum is measured at present
The method of efficiency mainly uses impulse method.The method must use the short square-wave pulse of pulsewidth, but still cannot prevent to light completely
Temperature rises during diode operation, and due to using the pulse power, what light emitting diode was sent is passage of scintillation light, and passage of scintillation light is adopted
Collect difficulty big.
The content of the invention
It is an object of the invention to provide can eliminate the influence of light emitting diode fuel factor, measurement apparatus to be simple and convenient to operate
A kind of quantum efficiency of LED measurement apparatus and its measuring method.
The quantum efficiency of LED measurement apparatus is provided with computer, digital power table, temperature control source table, temperature control
Fixture, spectrometer and thermal infrared imager；The temperature control fixture clamps light emitting diode to be measured, the connection of digital power apparent source the two poles of the earth
Light emitting diode to be measured, digital power table is electrically connected with calculating mechatronics, computer with temperature control source table, temperature control source
The supporting temperature sensor of table and heating plate are mounted on temperature control fixture, and spectrometer is with calculating mechatronics, infrared thermal imagery
Instrument is with calculating mechatronics.
The quantum efficiency of LED measuring method comprises the following steps：
1) quantum efficiency of LED measurement apparatus is used；
2) one group of temperature value T is set by temperature control source table, one group of temperature value of setting comprises at least 5 different temperature
Value T, the temperature value is less than the invalid temperature of light emitting diode to be measured, while by digital power table setting electric current value I, the electricity
Flow valuve I is less than the failure electric current of light emitting diode to be measured；
3) set one group of temperature value and set current value are pressed, measurement respectively obtains different temperature control fixture temperature values
TSUnder light emitting diode one group of quantum efficiency η；
4) by step 3) measured by one group of quantum efficiency η, first draw under the conditions of different current value I quantum efficiency η with
Temperature T graph of a relation, then carries out fitting a straight line by following formula (1)：
η=λ1(I)-λ2(I)*T (1)
Obtain one group of λ corresponding with current value I1And λ (I)2(I) coefficient；
5) control temperature control fixture is temperature-resistant, the output current of digital power table is started from scratch and gradually increases, infrared
Thermal imaging system measures and records the temperature T (I) of light emitting diode, and the electric current of measurement is no more than the failure electric current of light emitting diode, then
It is fitted by following formula (2)：
T (I)=A+B*I (2)
6) the temperature-resistant of temperature control fixture is kept, the output current of digital power table is started from scratch and gradually increases, spectrum
Instrument measures and records the quantum efficiency η being influenced by heat of light emitting diode, and the electric current of measurement is no more than the failure of light emitting diode
Electric current；
7) quantum efficiency (η ') eliminated in the case of heat affecting is obtained by formula (3)：
η '=η+B* ∫ λ2(I)dI. (3)。
Compared with the prior art, beneficial effects of the present invention are as follows：
Computer changes luminous two by the output signal for the commanded temperatures voltage input table prearranged by temperature control fixture
The junction temperature of pole pipe；Computer controls digital power table to apply electric current to light emitting diode；Thermal infrared imager and spectrometer test knot
Fruit feeds back to computer and preserved so as to post-processing.By indirect method, can measure light emitting diode eliminate heat affecting it
Quantum efficiency afterwards, it is to avoid the fuel factor influence carried under pulse current working condition during LED test；Luminous two
There is good linear relation between the quantum efficiency and junction temperature of pole pipe.
Brief description of the drawings
Fig. 1 is the quantum efficiency of LED measurement apparatus and use schematic diagram that the embodiment of the present invention is built.
Fig. 2 is quantum efficiency of LED of embodiment of the present invention measurement quantum efficiency and temperature change graph of a relation.In Fig. 2
In an exposition electric current result, abscissa is kelvin degree, and ordinate is quantum efficiency.
Fig. 3 is the temperature-current graph of relation of light emitting diode of the embodiment of the present invention.In figure 3, temperature control fixture temperature
Value is arranged on 300K；Abscissa is electric current, and ordinate is kelvin degree.
Fig. 4 is the quantum efficiency and current relationship curve that light emitting diode of the embodiment of the present invention is influenced by heat at room temperature,
With the quantum efficiency and current relationship curve for removing heat affecting.In Fig. 4, abscissa is electric current, and ordinate is quantum efficiency.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Measuring method described in the present embodiment, comprises the following steps：
1) quantum efficiency measuring device is built
As shown in figure 1, quantum efficiency measuring device is provided with computer 1, digital power table 2, temperature control source table 3, temperature control
Fixture 4, spectrometer 6 and thermal infrared imager 7；
Temperature control fixture 4 clamps light emitting diode 5 to be measured, and light emitting diode 5, number are surveyed in the reception of the two poles of digital power table 2
Word power meter 2 is electrically connected with computer 1, and computer 1 is electrically connected with temperature control source table 3, the supporting temperature of temperature control source table 3
Degree sensor 31 and heating plate 32 be mounted on temperature control fixture 4, spectrometer 6 is electrically connected with computer 1, thermal infrared imager 7 and
Computer 1 is electrically connected；
2) one group of temperature value T is set by temperature control source table 3, one group of temperature value 300K of setting, 305K, 310K, 315K,
320K, 325K and 330K, these temperature values are less than the invalid temperature of light emitting diode 5 to be measured, while being set by digital power table 2
Current value 1mA, measurement obtains the corresponding one group quantum efficiency value of the light emitting diode under different temperatures value；
3) by step 2) measured by one group of quantum efficiency value, first draw the graph of a relation of quantum efficiency and temperature, then
Fitting a straight line is carried out by following formula (1)：
η=λ1(I)-λ2(I)*T (1)
Obtain one group of λ corresponding with current value (I)1And λ (I)2(I) coefficient；
4) current value, repeat step 2 are gradually increased) and 3), obtain the quantum corresponding to different temperatures value under different electric currents
Efficiency value, and a series of λs corresponding with current value (I)1And λ (I)2(I) coefficient, as shown in Figure 2；
5) control temperature control fixture 4 is temperature-resistant, the output current of digital power table 2 is started from scratch and gradually increases to
300mA, thermal infrared imager 7 measures and records the temperature T (I) of light emitting diode 5, as shown in Figure 3.The electric current of measurement is no more than hair
The failure electric current of optical diode 5, then be fitted by following formula (2)：
T (I)=A+B*I (2) obtains A, B coefficient value.
6) the temperature-resistant of temperature control fixture 4 is kept, the output current of digital power table 2 is started from scratch and gradually increases, light
Spectrometer 6 measures and records the quantum efficiency η being influenced by heat of light emitting diode 5, and the electric current of measurement is no more than light emitting diode 5
Fail electric current.
7) quantum efficiency (η ') eliminated in the case of heat affecting can be obtained by formula (3)：
η '=η+B* ∫ λ2(I)dI. (3)。
Fig. 4 is the quantum efficiency and current relationship curve that light emitting diode was influenced by heat and excluded heat affecting.It can be seen by Fig. 4
Go out, by light emitting diode heat affecting, quantum efficiency is relatively low.Quantum efficiency can increase after eliminating heat affecting.
Measuring method described in the present embodiment can eliminate the influence of light emitting diode fuel factor, obtain light emitting diode without thermal effect
The quantum efficiency answered.
Claims (2)
1. a kind of quantum efficiency of LED measurement apparatus, it is characterised in that provided with computer, digital power table, temperature control
Source table, temperature control fixture, spectrometer and thermal infrared imager；The temperature control fixture clamps light emitting diode to be measured, digital power table electricity
Source the two poles of the earth connect light emitting diode to be measured, and digital power table is electrically connected with calculating mechatronics, computer with temperature control source table,
The supporting temperature sensor of temperature control source table and heating plate are mounted on temperature control fixture, and spectrometer is electrically connected with computer
Connect, thermal infrared imager is with calculating mechatronics.
2. quantum efficiency of LED measuring method, it is characterised in that comprise the following steps：
1) quantum efficiency of LED measurement apparatus is used；
2) one group of temperature value T is set by temperature control source table, one group of temperature value of setting comprises at least 5 different temperature value T,
The temperature value is less than the invalid temperature of light emitting diode to be measured, while by digital power table setting electric current value I, the current value
I is less than the failure electric current of light emitting diode to be measured；
3) set one group of temperature value and set current value are pressed, measurement respectively obtains different temperature control fixture temperature value TSUnder
Light emitting diode one group of quantum efficiency η；
4) by step 3) measured by one group of quantum efficiency η, first draw quantum efficiency η and temperature T under the conditions of different current value I
Graph of a relation, then pass through following formula (1) carry out fitting a straight line：
η=λ1(I)-λ2(I)*T (1)
Obtain one group of λ corresponding with current value I1And λ (I)2(I) coefficient；
5) control temperature control fixture is temperature-resistant, the output current of digital power table is started from scratch and gradually increases, infrared thermal imagery
Instrument measures and records the temperature T (I) of light emitting diode, and the electric current of measurement is no more than the failure electric current of light emitting diode, then passes through
Following formula (2) are fitted：
T (I)=A+B*I (2)
6) the temperature-resistant of temperature control fixture is kept, the output current of digital power table is started from scratch and gradually increases, spectrometer is surveyed
The quantum efficiency η being influenced by heat of light emitting diode is measured and records, the electric current of measurement is no more than the failure electric current of light emitting diode；
7) quantum efficiency (η ') eliminated in the case of heat affecting is obtained by formula (3)：
η '=η+B* ∫ λ2(I)dI. (3)。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108535878A (en) * | 2018-04-17 | 2018-09-14 | 清华大学 | Stablize the method for quantum light source and stablizes quantum light source |
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Cited By (2)
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| CN107228710B (en) | 2018-08-07 |
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