High Power High Efficiency DUV LEDs and Applications...1&Liter&Water&Cup&with&UVC&Disinfec-on&Module...

LED TAIWAN IR+UV SUMMIT 2016

- High Power High Efficiency - DUV LEDs and Applications

James Wu Research and Development Qingdao Jason Electric Ltd Qingdao, 266101 China

April 14th 2016 TWTC Nangang Exhibition Hall

Qingdao Jason Electric Ltd 1

Presentation Outline

1. Introduction

2. Development and Performance of DUV LEDs

3. Applications for DUV LEDs

4. Conclusions


Background of QD Jason

1.  Founded on 2001

2.  2001-2008 focusing on HT AlGaN-MOCVD equipment R&D and manufacture

3.  2009 moved to development of DUV LEDs using homemade MOCVD

4.  2013 started to ship DUV LEDs samples with miliwatt power

5.  2014 awarded BSI ISO9001:2008 Quality Management System certificate

6.  2015 acquired by Epitop Technology Inc of China

7.  Epitop Technology Inc is a top 5 visible LEDs maker in mainland China


Applications on UV LEDs


Nail manicure Bills ID Check

UV-B

UV-A

UV-C

phototherapy

DNA Sequencing

Air purification

Food sterilization

Water Purification

Ozone Monitering

Healthcare

Ink printing

Agriculture

Curing

Global UV LEDs Technology Market


Snapshot Summary of Trends and Drivers


1.  Growing in food ,workspace and air sterilization drives market expension

2.  Ban on mercury based lighting solutions benefits the UV LEDs technology

3.  Curing applications to generate a Chuck of Market Revenue

4.  UV LEDs continue to gain widespread popularity in inkjet printing

5.  Development of UVB LEDs phototherapeutic devices to spur opportunities in the healthcare sectors

6. Strong growth in UVC consumer electronics to bring in new market

opportunity

Role Players of DUV LEDs (<=310nm)


China

South Korean

Japan USA

u Nikkiso u Akasaki u Tokuyama

u  SETI u Rayvio u Crystal IS

u  LG Innotek u Soul Viosys

u Qingdao Jason

l  Nikkiso 50mW @ 350mA production at 2016 l  Tokuyama 90mW@350mA R&D l  SETi 30mw@350mA production l  Akasaki & Crystal IS 20mW@400mA l Rayvio 45mW R&D l QD Jason Ltd 176mW@1A R&D, 5-20 mW production

More visible LEDs makers may move toward DUV LEDs

Advantages of UV LEDs


1.  Customerizable UV light source

2.  Green energy and environmental friendly with no mercury filled

3.  Instant On/Off no warm up time

4.  Longer life time compared to mercury lamp

5.  Easy integration with lower voltage and small dimension

6.  No ozone production

Compared to Conventional UV Light Source UV LEDs has Significant Advantages

UV LEDs Design


DUV LED

Ø  Bandgap Engineering is the basic of DUV LEDs design

Ø  255nm to 350 nm UV LEDs is realized by combination of AlGaN material system

UV LEDs Structure and Challenges


Sapphire /AlN

n+-AlGaN buffer

MQW

p-AlGaN

p+-GaN

SL

Ø  Flip Chip Structure

Ø  Sapphire heating dissipation

Ø  AlN transparency

Ø  AlN buffer quality and thickness

Ø  P-GaN absorption

Ø  Contact electrode absorption

Ø  Defects density cause low IQE

Ø  Low EQE

Go vertical

Remove substrate

Nano pss/ELO

P-AlGaN contact

Reflective

Quality

LEE+IQE

IQE Improvement Approach


AlN quality and whole DUV LEDs structure quality is the key to improve IQE

Growth of DUV LEDs on Sapphire remains to be a challenge!

Bulk AlN Substrate AlN ELO Thicker AlN Template

DD- 105cm-2 DD- 108cm-2 DD- 109cm-2

Ø HVPE Template Ø MEMOCVD Template

LEE Improvement Approach (1)


•  Sapphire substrate with Moth-eye pattern on back side Ø On wafer Improvement of Output Power by×1.5 • Hybrid nano photonic pattern on back side of AlN substrate by HVPE Ø  High power with high efficiency 265nm

“Light extraction enhancement of 265 nm LED with over 90 mW output power via an AlN hybrid nanostructure”

C.Pernot, M. Kim, S. Fukahori (APE 2010) S-I Inoue, T. Naoki (APL 106 2015)



Trade Off Between LEE and Ø  There is a trade off between voltage and LEE improvement Ø  Loss of ohmic contact resistance on P side material

Reflective Electrode Design

Max Shatalov, W-H Sun etl, SETi

Transparency no P-GaN design

Lobo et al. Appl. Phys. Lett. 96, (2010) 081109



Han Youl Ryu，nano scale research letters, 2014

Ø Nano Rod UV LEDs Structure is expected to improve LEE up to 50% according to Han’s simulation



Encapsulation

Ø Encapsulation can improve light extraction efficiency

Ø However usually most resins are decomposed under DUV light

Ø Studying under DUV range is still underway

“Development of underfilling and encapsulation for deep-ultraviolet LEDs “ K. Yamada, Y. Furusawa, S. Nagai, Amano Hiroshi, Akasaki Isamu Applied Physics Express, Volume 8, Issue 1, 2015

Trade off between encapsulation and reliability!

Low Voltage High Power 280nm UV LEDs


Ø  176mW optical power was achieved at 1A dc operation for single 4545 device Ø  46 mW optical power at 200mA for 1515 device Ø  Voltage is as low as 5.8V at 1A for 4545 device Ø  Differential resistance is less than 1 ohm at high current

ü Encapsulation ü Reflection on Packaging ü High quality AlN Template ü Thicker and quality N-AlGaN ü Good ohmic contact for N and P ü Good heat dissipation

0 200 400 600 800 10000

20

40

60

80

100

120

140

160

180

200

Power Voltage

Current (mA)

Pow

er (m

W)

small die IV

large die IV

large die L-I

small die L-I

0

1

2

3

4

5

6

7

8

9

10

Vol

tage

(V)

CW 280nm UV LEDs

Low Voltage High Power 280nm UV LEDs


Ø  5% EQE for 4545 small device Ø  8% EQE for 1515 large device

0 100 200 300 400 500 600 700 800 900100011000

25

50

75

100

125

150

175

Current (mA)

Pow

er (m

W)

small die L-I

0

2

4

6

8

EQE&

WPE

%

EQE

WPE

L-I

WPE

EQE

large diesmall die

Efficiency droops faster for smaller device

Stress for 280nm UV LEDs


Ø  over 3000 hrs was measured at 20mA for 1515 device Ø  estimated L50 is about 8000 hrs

0.1 1 10 100 1000 1000020

30

40

50

60

70

80

90

100

Rela

tive

Pow

er (%

)

Stress Time (Hrs)

Nikkiso’s 285nm UV LEDs


Ø Over 10000 hrs life time achieved at L70! Ø Driving current affects life time of DUV LEDs

DUV LEDs Application


Dis

infe

ctio

n ef

ficie

ncy

Wavelength

Ø 265-270nm has the best disinfection efficiency

DUV Applications


Ø Water Disinfec-on •  UVC LEDs has effec.ve penetra.on in water •  Portable water Steri Pen •  Drinking water machine •  Air Purifier

Drinking Water


Sta-c Water Disinfec-on Experiment

1 Liter Water Cup with UVC Disinfec-on Module 1 Liter water Cup without UVC Module

Experiment Details: •  UCV module with1mW power was set up on for 2mins once a hour for disinfection • For the first two days every 24 hrs take 0.1ml water sample for experiment • From 3rd day to 7th day every 12 hrs take 0.1ml water sample for experiment

UVC Module No UVC

Water Level Water Level


Disinfec-on Experiment Data

图9深紫外抑菌模块抑菌对比图

UVC Irradiation

No UVC Irradiation

Bac

teria

l cou

nt

•  UCV LEDs Module can effectively prevent bacterial from growing •  Without UVC irradiation the water easily reach to high level of bacterial


Flowing Water Instant Disinfec-on Experiment

• 2 UVC LEDs Units can be installed at water inlet and outlet for instant disinfection

After Before


Air Disinfec-on Module

UVC LEDs Arrays Module Air Purifier


Air Disinfec-on Module Explosion Structure

UVC LEDs Module

Filter Fan


Food Disinfec-on Module and Experiment

Ø Improving foods lifetime Ø  Removing order Ø  keeping fresh

UVC LEDs Module For Fridge

Upper Level No UVC

Bottom Level with UVC

Mouldy

No mouldy


Medical Instrument and Health Care

UVC Sanitizing Toothbrush Case

UVC Scanner UVC Contact Lens Case UVC Bandage

Conclusions


Thank � You � For � Your � Attention！ � �

•  DUV LEDs has advantages compared to conventional mercury lamp

• We have achieved high efficiency and high optical power DUV LEDs • Record high output power of 170mW at 1A was achieved due to high material quality and good device fabrication and good encapsulation and packaging •  DUV LEDs applications have been becoming real now.

High Power High Efficiency DUV LEDs and Applications...1&Liter&Water&Cup&with&UVC&Disinfec-on&Module...

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