Home/
Technology

LED Phosphors

Phosphor in Glass

High CRI LED Lighting

High TLCI LED Lighting

TM-30-18 Tested LED

Tunable Spectrum

Flip Chip COB

Custom LED PCB

Spectrum Customization

/
Products
/
Applications

Photography & Studio Lighting

Film Lighting

Color Management

Horticulture Lighting

Aqurium Lighting

Human Centric Lighting

Art Gallery & Museum Lighting

Medical Lighting

/
About Us/
Blog/
News/
Career/
Home
Technology

LED Phosphors

Phosphor in Glass

High CRI LED Lighting

High TLCI LED Lighting

TM-30-18 Tested LED

Tunable Spectrum

Flip Chip COB

Custom LED PCB

Spectrum Customization

Products
Applications

Photography & Studio Lighting

Film Lighting

Color Management

Horticulture Lighting

Aqurium Lighting

Human Centric Lighting

Art Gallery & Museum Lighting

Medical Lighting

About Us
Blog
News
Career

Flip Chip COB

High lumen density COB solution by YUJILEDS.

Scroll Down

What are the differences between
traditional face-up and flip chip LED COB packaging technologies?

  • 01

    Difference on LED packaging structure

  • 02

    Improving the thermal conductivity by reducing the heat dissipation path

Features of YUJILEDS flip chip COB packaging:

Comparing with standard face-up LED packaging technology, wire bonding has been avoided in YUJILEDS flip chip packaging technology, thus no risk of gold wire breakage.

Comparing with standard flip chip packaging technology, eutectic bonding between LED chip and substrate in YUJILEDS flip chip packaging technology result in excellent thermal conductivity for this whole device.

For the high power COB, the culprit of reliability decay is heat:

The flip chip structure of the COB transfers the heat directly to the substrate, so the efficiency can be largely increased.

The AlN substrate of the COB has a heat transfer efficiency as high as about 300 W/(m•K), twice of Al substrate, and six times that of Al2O3 substrate.

Why small light emitting surface (LES)?

  • Manufacturing cost

    Easier optical design: smaller LES means easier secondary optical design, makes more compact and portable light fixture realizable.

  • Higher mobility

    Less manufacturing cost: less BOM and manufacturing cost should be used in more compact light fixture.

More than just small,
excellent performance also achieved

  • High CRI
  • High reliability
  • Extremely small color shift

High CRI

With reliable phosphor properties, appropriate mixing ratio and the unique packaging process technology, this COB has a CRI (Ra) as high as 95 even at a CCT of 5600K.

High reliability

The maintenance rate of the initial lumen flux of the high lumen density COB at 12 amperes drive current is more than 98% after 9000 hours continuous light up.

Extremely small color shift

The high lumen density COB shows a color temperature shift smaller than +/-50K after 9000 hours and the chromaticity shift from black body curve is less than +/-0.001.

Development concept

A chip on board (COB) light source has a small light emitting surface (LES) and large luminous flux, thus it is usually used in directional lighting fixtures. However, keeping a COB small is extremely challenging, because the compact arrangement accelerates heat accumulation and compromises the performance. Therefore when designing a COB, it is always the key point to improve the luminous flux and the reliability while controlling the LES.

Based on this principle, YUJILEDS high lumen density COB was developed, the world's highest lumen density LED.

Potential applications
of flip chip COB

  • Stage lighting

  • Horticultural lighting

  • Sport lighting

  • Inspection lighting

Blog

  • The industry of LED grow light needs a more accurate and detailed biological basis
  • Why is there still visible color difference between two lights, even at the same CCT?
  • Things about LED Bins
  • Do LEDs improve students performance or hurt their eyes?
  • Yuji launched new 2in1 Tunable LED Module
  • Notice of Logo Change
  • Are CRI and luminous efficacy influencing the photosynthetic photon efficacy?
  • A Deep Tour on LED Phosphor Part III: Performance of Phosphor Based LEDs
  • A Deep Tour on LED Phosphor Part II: Phosphor's Performance
  • A Deep Tour on LED Phosphor Part I: What is LED Phosphor?
TechnologyProductsApplicationsAbout UsBlogNewsCareer

Beijing Yuji International Co., Ltd

Copyright © 2021
Technologies
LED Phosphors
Phosphor in Glass
High CRI LED Lighting
High TLCI LED Lighting
TM-30-18 Tested LED
Tunable Spectrum
Flip Chip COB
Custom LED PCB
Spectrum Customization
Contact

3711 Long Beach Blvd.

5th Floor Room 5053 Long Beach, CA 90807, USA

TEL: +1-562-391-9140

Room 1502, Building No.6

Jia No.2 North Xisanhuan Road

100081, Beijing, China

TEL: +86-10-6829-0301

E-mail
info@yujigroup.com