uv leds的終端新應用 leds的終端新... · 2013. 9. 11. · uv leds的終端新應用 genesis...
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UV LEDs的終端新應用
Genesis Photonics, Inc. 新世紀光電R&D center 研發中心Cheng-Yen Robert Chen, Ph. D.陳正言博士2013/09/04
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Outline
¤Introduction to UV applications
¤Development Status of UV LEDs
¤Photoinitiated polymerization for UV LED active packaging and waveguide devices
¤Summary
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UV Spectrum Range
• UVA能透入皮膚深部,氧化黑色素物質,使皮膚黑化,增強抵抗,也會導致黑色素瘤(Melanoma)。
• UVB可促進皮膚生成維生素D,引發皮膚下血管擴張,增加血流量,造成血管亢進發紅,進而成紅斑,脫皮、甚而發炎等。
• UVC有強烈的殺菌能力,破壤細胞DNA,可造成皮膚病變,灼傷眼角膜等。
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X-ray UV Visible Infrared
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List of UV Applications
• 230 to 400 nm: optical sensors and instrumentation• 240 to 280 nm: sterilization of surface areas and water• 250 to 405 nm: forensic and bodily fluid detection and analysis• 260 to 300 nm: DNA/RNA/protein analysis, drug discovery• 300 to 320 nm: medical light therapy• 365 to 400 nm: polymer and ink printing• 375 to 395 nm: counterfeit detection• 390 to 410 nm: superficial/cosmetic sterilization
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Source: http://electronicdesign.com/energy/
•治療乾癬 (311nm),白斑,濕疹
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Intensity-dependent UV applications
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UV-C
UV-A
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Nitride UVLEDs
6
3.1 3.2 3.3 3.4 3.5
1
2
3
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1
2
3
4
5
6
InN
GaN
AlN
ZnO
Band
gap
Ener
gy (e
V)
Lattice Constant (Å)
Bandgap Energy vs. Lattice Constant
400nm
200nm
UV-B
AlGaInN LEDs can cover UVA, UVB and UVC spectral range
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Benefit of UV LEDs• Compactness• Robustness• low cost of ownership (system level)• Environmentally-friendly composition
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Nichia
Luminus Devices
GPI SemiLEDs Crystal IS
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UV LED business with 43% CAGR from 2012 to 2017
Source: UV LEDs report, March 2013, Yole Dévelopement
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Development Status of UV LEDs
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Development of UV LEDs
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Source: http://www.i-micronews.com/Upload/iLED/iLED_June2013_IR.pdf
• 1st- UVA for Printing• 2nd- UVA for Curing• 3rd- UV-B and UV-C applications
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Performance Improvement of UV LED @ 395nm
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> 20x improvement for the last decade
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600mw
250mw
330mw
UVA LED Development in GPI
2009 2010 2011 2012 2013 201450
100
150
200
250
300
350
400
450
500
550
600
650
405nm 385nm 375nm
Die : 1x1 mm2
mW : GPI PKG Lamp @ 350mA
Rad
ial f
lux
(mW
)
Year
365nm
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Hot (85oC)/Cold(25oC) factor of UVA LEDs
0 20 40 60 80 100 120 140
40
50
60
70
80
90
380nm 405nm 450nm
Hot
/Col
d Fa
ctor
(%)
Current Density (A/cm2)
ü Unlike blue InGaN LEDs, UV LEDs exist higher hot/cold factor at higher operation current density.
ü May be suitable for flip-chip design.
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GPI flip chips- AT LED
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ü Higher power density (W/cm2)ü Better reliabilityü Better thermal conductivityü Overdrive capability
Benefits of flip chips
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GPI UV flip-chip LED
• Deliver more than 2000 mW/cm2 (390nm) in working distance• Lifetime > 20000 hrs• Operate at more than 100W
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Module5050: 4*4(64ea of 45mil dies)
25mm
25mm
陶瓷基板
PCB板
(Top view)
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Nail Gel UVA curing System
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ü Wavelength: 390 to 410nmü 45mil flip chip operated @ 700mA to 1Aü Curing time: within 30 seconds
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Development of UVC LEDs
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UV-C Applications
• Germicidal Disinfection• Water Purification• Surface Sterilization• Air Purification• Analytical Instrumentation, Emitters• Protein Analysis, DNA Sequencing, Drug Discovery• Forensic Analysis• Optical Sensing• Ozone Monitoring
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λ
Absorption
260nm 280nm
DNA/RNA
protein
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Comparison of UVC LED with Mercury lamp and Xenon lamp
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Source:http://www.cisuvc.com
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EQE from 10% to >50%l AlInGaP Red LED : 1988à2000 (12 years)l InGaN Blue LED : 1998à2007 (9 years)l AlInGaN DUV LED : 2012à2020 (8 years or less) ??
LED history from Red to DUV
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Source: Hideki Hirayama (RIKEN) report in “LED 50 YEARS”
Evolution of UV-C LED Performance-by RIKEN, Japan
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Evolution of UV-C LED Performance-by RIKEN, Japan
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Source: Hideki Hirayama (RIKEN) report in “LED 50 YEARS”
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A commercial UVB LED
2013/3
Al2O3
AlxGa1-xN (8μm)
AlN/AlGaN SLS
AlGaN/AlGaN SLS
AlxGa1-xN (0.3μm)
AlxGa1-xN (0.4μm)
AlN buffer (2.4 μm)
ü The epitaxial structure is quite different from InGaN blue LEDs.
ü Much larger forward voltage remain space of improvement.
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120mw 90mw 13mw 1mw
EE=75% IQE X EE=15% LEE=8%
WPE=0.8%
Commercial 275nm LED performance
l (1) Dislocation reduction (IQE)Ø quality of AlN on sapphireà TD ~2~3 E8 /cm2 , (0 0 2)=190 arsec , (1 0 2)=300 arsecØ n-AlGaN Al=60% à (0 0 2)=307 arsecØ MQWà IQE > 50%
l (2) Reduction of optical loss (LEE)Ø high absorption in p-layer à p-AlGaN/AlGaN SL 60% Transmission @275nmØ low contact reflection in DUV à p-pad R=70% , n-pad R=50% @275nmØ lack of encapsulation à surface roughing & encapsulated
l Summary Ø LEE > 25% ,IQE>50% à EQE>11% , WPE>7%
EQE breakdown
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Highlights of some UVC LED Performance
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Company Wp IQE LEE EQE WPE
UV Craftly Co. Ltd 285nm >80% 15%14.3%(peak)>10% (normal) ---
SETI 275nm 55% >25% 11% 7%
Meijo Univ. ~365nm 29% 11.4% 3.4% 2.6%
Berlin Technical Univ. 305nm 23% 4.5% 0.5%
Crystal IS270nm260nm 70% 15%
8.2%@100mA6.5%@65mA
4.5%4.9%
(Data updated in 2012)
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ü IQE depends on high quality AlxGa1-xN material & structure design.
ü LEE is very important for DUV development , including material absorption & chip reflectance process.
ü Thermal decay , burn in decay , lifetime decay also need to be considered seriously.
Brief Summary
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Photoinitiated polymerization for UV LED active packaging and waveguide devices
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Blue LED active packing method with photosensitive polymerization
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Ref: 17 March 2008 / Vol. 16, No. 6 / OPTICS EXPRESS, 3680
An optical curing process
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Chain reaction of photo-induced polymerization
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GPI collaboration with National Taiwan University
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Simulation of UV propagation
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Simulation Results
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Constant LED power Constant exposure time
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Experimental results
32
GPI collaboration with National Taiwan University
ü Suitable for flip chips (no wire bonding)ü mm-scale optical lensü Control of LED radiation pattern through UV exposure conditions
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UV-induced photo-initiated polymerization for self-written waveguides
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X-type waveguide
Y-type waveguide
Simulation Results
ü Combining with automation control, similar to 3D printing technology, complex optical coupling devices could be fabricated.
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Summary
• With outstanding properties, UV LEDs provides versatile application possibilities.
• Applications of UVA LEDs in printing and curing industry are increasing firmly.
• The population of UVB/UVC LED applications depends strongly on the performance improvement of UV LEDs.
• Novel applications of UV LEDs are expected to come along with LED technology breakthrough.
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