Heat generated increases in high power LED applications.
However, GCHP improves the durability of LEDs through a wide range of wavelengths, including the IR~UV bands and enables them to be used for high-power applications, as they are more reliable than conventional resin and alumina substrates in terms of heat dissipation and discoloration. In addition, its reflectivity is 20% higher than that of alumina substrates, so intensity may be increased effectively.
GCHP heat release performance can increase the output power which supports the growing demands in semiconductor lasers market


  • Visible LED
    automobile, residential and commercial lighting, interior and exterior lighting, traffic road, tunnel lamps, replacement of Hg lamps, security lighting, medical light, etc.
  • IR LED
    driving monitor, security cameras, sensing camera, night vision
    gesture recognition, communication lamp, etc.
  • UV LED
    resin curing, sterilization, water purification, medical lamp,
    color rendering, etc.
  • Semiconductor Laser(EEL/VCSEL)
    headlamp, projector, 3D sensing, ToF camera,
    autonomous driving system (LiDAR), etc.
  • Others Various electronic devices
    Devices for optical communication, MEMS sensor, Secondary battery・All solid state battery etc.

Water purification

(visible LED)

Sensors on Autonomous
driving (VCSEL)



  • Integrated development from glass material to finished products
  • Product lineup with high reflection (white substrate) and high absorption (black substrate)
  • High heat release efficiency for high power applications
  • Package size reduction capability by 3D circuit integration (multilayer)
  • High reliability realized by glass (no color change)
  • High hermetic properties of dense glass
  • Prevention of solder cracking by glass


GCHP (Glass Ceramics Hybrid Package) is a newly developed glass ceramic packaging substrate combining of LTCC(Low Temperature Co-fired Ceramics) and advanced AGC glass material technologies.

GCHP has various advantages as mentioned above. Using the high reflectivity, high reliability and high heat release efficiency, it is suitable for automotive exterior lighting (headlight). GCHP also has high reflectivity outside visible spectrum, it is also suitable for high power UV-C LED and NIR LED where demands are rapidly increasing for next generation devices. We can design GCHP packaging for edge emitter laser (EEL), surface emitting laser (SEL) and vertically cavity surface emitting laser (VCSEL). Our design is most suitable for the recent market trend requirement of high output power . Especially VCSEL, which attracts increasing attentions for 3D sensing and LiDAR, requires high heat release performance and high reliability, so that it is also one of the suitable applications of GCHP.

High heat releasing for high-power applications

Heat releasing is a very important factor for high-power LDs to prevent laser beams from becoming unstable when they heat up. LTCC substrates themselves generally have low heat conductivity, but GCHP can have an Ag (silver) block in it, and the Ag block has high heat conductivity. That is the advantage of GCHP substrates. This heat sink structure gives a high heat releasing performance.
When making substrates using Al2O3 (alumina), a commonly used substrate material, they must be fired at a high temperature. So, it is impossible to use conductor materials having high thermal conductivity, such as Cu (copper) and Ag (silver), and this makes it impossible to achieve high heat releasing. GCHP uses Ag and can effectively release heat.

GCHP substrates can use an Ag heat sink and can take advantage of the high thermal conductivity of Ag. The graph compares the thermal conductivity of GCHP substrates with that of HTCC substrates, such as those made of Al2O3 (alumina) and AlN (aluminum nitride), as well as the thermal conductivity of W (tungsten) used as the conductor of HTCC substrates. As shown in the graph, the use of Ag (silver) enables GCHP to achieve a high heat releasing performance.

Product lineup with high reflection and high absorption

Light has the property of reflecting off at interfaces of materials with different refractive indices. Because GCHP is a hybrid material of glass and ceramics, reflection is repeated at interfaces between glass and ceramics, and that is why it has high reflection characteristics. We have developed a glass composition that can incorporate a large amount of ceramic filler while maintaining the glass network structure, and this has made it possible to manufacture highly reflective package substrates.

The level of reflectivity a substrate must have depends on the design of the optical sensing device. AGC provides both white and black GCHP substrates: the former has high reflectivity, while the latter has low reflectivity.

High reliability ensured by glass composition

Since GCHP contains glass components, it has a low Young's modulus. In such a substrate, stress is dispersed without being concentrated on a part. This characteristic is not found in ceramic substrates, and is effective in preventing cracks not only in the substrate but also in the peripheral parts of the mounted substrate.
LiDAR systems are expected to be used outdoors and must have UV resistance. GCHP, a composite of glass and ceramics, hardly deteriorates when exposed to ultraviolet irradiation.
There is a stringent test called the sulfur resistance test to check the durability of package substrates. Package substrates must pass the test when they are assumed to be used for outdoor or automotive applications. GCHP does not deteriorate even under a sulfur-containing environment.

Diverse design realization and miniaturization by 3D circuit formation

GCHP substrates are fabricated in accordance with the LTCC process. A metal pattern, such as Ag, is formed on an unfired substrate called a green sheet, and the substrate is fired after being multilayered. This process make it possible to form inner layer wiring and produce a three-dimensional circuit. As a result, it becomes possible to downsize the package size and to flexibly design package substrates including surface-mounted ones.
In sensing applications, GCHP substrates are used in combination with optical elements such as diffusers.AGC provides solutions including optical elements such as lenses, diffusers, and DOEs.

LTCC package with surface-mounted devices.
Another chip can be mounted on separate wiring from that of the chip in the center to control the characteristics of devices mounted on the surface.
These GCHP features contribute to various performance and reliability enhancements in many products.

Performance comparison of ceramic package substrates

The features of GCHP are compared to those of other ceramic materials. Since Ag functions as a heat sink, GCHP has high heat releasing performance.
By making use of the characteristics of glass and ceramics as the materials used, it has high reliability.It is an LTCC product that takes advantage of the characteristics of glass and ceramic as materials, and has high reliability.
Furthermore, GCHP allows more complicated inner layer wiring, which contributes to flexible and high-density designs.

Item GCHP Al2O3 AlN
Heat release Excellent

(heat sink)

Average Excellent

(High reflectance)


(White substrate)

Good Poor

(High absorption)


(Black substrate)

Poor Excellent
Reliability Excellent Average Excellent
Multi-layer structure Excellent Average Poor


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Unit design Top of unit Bottom of unit Array design
3528 size
3532 size
3535 size
4343 size