What QSI does

QSI (Quantum Semiconductor International) is a South Korea-based specialized manufacturer of compound semiconductors with integrated EPI (epitaxial growth), FAB (wafer fabrication), and PKG (packaging) capabilities serving B2B customers across seven countries. Founded in 2000 and headquartered in Cheonan, Chungcheongnam-do, with a manufacturing subsidiary (Quintec) in Weihai, China, the company employs 101–250 people and produces red and infrared laser diodes as finished products while offering foundry services for VCSEL (Vertical-Cavity Surface-Emitting Lasers), RF devices (MMICs based on GaAs HEMT and HBT processes), and Micro LED devices. Its technology platform spans GaAs, InP, and related III-V compound semiconductor process know-how, with proprietary developments including 905nm 4-channel pulsed laser diodes for automotive and industrial LiDAR, InP HEMT MMICs for quantum computing applications, and 3D monolithic integration for red Micro-LED.

The company's revenue model is hybrid: hardware sales of finished laser diode products to industrial sensor, factory automation, medical, printing/imaging, safety, and consumer electronics customers (including HP, Honeywell, Lexmark, Zebra, Bosch, JENOPTIK, Leica, SICK, Ricoh, Sharp, LG, Garmin, HTC, Hyundai), combined with managed foundry services for fabless semiconductor and IDM customers needing VCSEL, RF, and Micro-LED epitaxial and device fabrication. Go-to-market is sales-led and direct, leveraging participation in Photonics West, APMC, the Korean Conference on Semiconductors, and technical publications to build credibility with engineering buyers. R&D activity — particularly the 6G E-MIMO base station RF components initiative and Micro-LED 3D monolithic integration breakthrough — suggests targeted expansion into automotive LiDAR, 5G/6G RF, advanced displays, and quantum computing applications. Leadership is anchored by CEO Chung Dae Lee; no parent company, M&A, or external funding activity is disclosed in the source material.

Name

QSI

Legal name

Quantum Semiconductor International (주)큐에스아이

Website

https://qsilaser.com

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

101–250 employees

Short description

QSI is a South Korea-based compound semiconductor manufacturer with integrated EPI, FAB, and PKG capabilities, producing red and infrared laser diodes as finished products and offering foundry services for VCSEL, RF/MMIC, and Micro-LED devices to B2B customers across seven countries.

Ownership category

akta.pro rank

Product category

Compound Semiconductor Manufacturing

NAICS

Semiconductor and Related Device Manufacturing (334413)

SIC

Semiconductors & Related Devices (3674)

akta.pro primary industry

Optoelectronic / Photonics Foundries (Silicon Photonics/LED/Laser) (HDAHACAG)

akta.pro secondary industries

Optoelectronic Emitters (LED/Laser/VCSEL) (HDAHALAL), RF & Compound Semiconductor Foundries (GaAs/GaN/SiGe) (HDAHACAD), Wafer Services & Reclaim (Epitaxy, Thinning, Reclaim) (HDAHACAH)

Keywords

• Compound semiconductor manufacturing
• Laser diode products
• VCSEL foundry services
• RF device MMIC
• Micro LED fabrication

Headquarters

HQ city

Chungnam

HQ country

South Korea

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Technology or R&D, Operations, Personnel, Infrastructure, Supply Chain

Revenue model

1. Laser Diode Manufacturing (Finished Products): QSI manufactures and sells finished laser diode products directly to customers. Products include red laser diodes and infrared laser diodes.
2. VCSEL Foundry Service: Provides VCSEL epitaxial wafer foundry and product development services to customers who need custom VCSEL devices.
3. RF Device Foundry Service: MMIC foundry service based on GaAs-based HEMT and HBT technologies targeting RF component manufacturers for 5G/6G applications.
4. Micro LED Foundry Service: High-efficiency Micro LED epi foundry and device fabrication service for red display light source applications.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

QSI (Quantum Semiconductor International) manufactures finished laser diode products (red laser diodes and infrared laser diodes) and provides compound semiconductor foundry services spanning EPI (epitaxy), FAB (wafer fabrication), and PKG (packaging) for VCSEL, RF devices, and Micro LED. The company serves B2B customers in factory automation, LiDAR, 5G/6G RF components, printing systems, medical devices, and consumer electronics with both finished products and foundry services.

Product overview

QSI (Quantum Semiconductor International) is a specialized manufacturer of compound semiconductors offering an integrated manufacturing platform spanning EPI (epitaxial growth), FAB (wafer fabrication), and PKG (packaging). The company's product portfolio includes laser diodes (both red and infrared), VCSEL (Vertical-Cavity Surface-Emitting Lasers), RF devices, and Micro LEDs. QSI operates both as a manufacturer of finished products (laser diodes) and as a foundry service provider for VCSEL, RF Device, and Micro LED components. The company serves diverse applications including LiDAR for autonomous vehicles, industrial sensing, and display technologies, supported by advanced R&D capabilities in compound semiconductor technologies.

Differentiator

Problem solved

Functional benefit

Products and services

• Laser Diodes (Red and Infrared) Finished laser diode products manufactured by QSI, including red laser diodes and infrared laser diodes, sold as finished goods to enterprise customers in factory automation, sensors, printing/imaging, safety systems, medical devices, and consumer electronics.
• Infrared VCSEL Vertical-Cavity Surface-Emitting Laser (VCSEL) products for infrared applications, supported by QSI's high-quality epi foundry and product development capabilities, targeting 3D sensing and infrared sensing applications.
• LiDAR Light Source High-power pulsed semiconductor laser diodes operating at 905nm with 4-channel configuration for Time-of-Flight (ToF) applications, designed for self-driving car LiDAR and industrial LiDAR sensors. Customers include KANAVI MOBILITY (LiDAR for autonomous vehicles) and HYUNDAI AUTOMOBILE (automotive LiDAR).
• RF Device R&D / MMIC Foundry Service Research and development and foundry services for RF devices using active elements such as HEMT (High Electron Mobility Transistor) and HBT (Heterojunction Bipolar Transistor), targeting ultra-high frequency and ultra-low noise MMIC (Monolithic Microwave Integrated Circuit) devices for 5G/6G E-MIMO base station RF components.
• Micro LED Epi Foundry and Device Fabrication High-efficiency Micro LED epi foundry and device fabrication service for red display light sources, using 3D monolithic integration technology to address red Micro-LED challenges. Customer LG is cited for Micro LED display applications.
• VCSEL Foundry Service High-quality VCSEL epitaxial (Epi) foundry service supporting VCSEL product development and customer-specific needs, provided to fabless semiconductor companies and device makers that require custom VCSEL epi wafers.
• Epi (Epitaxial Wafer) Service Epitaxial wafer manufacturing services for compound semiconductor devices, forming the EPI layer of QSI's integrated EPI, FAB, and PKG manufacturing capability.
• Fab (Wafer Fabrication) Service Wafer fabrication services delivered as part of QSI's integrated compound semiconductor manufacturing capabilities, used for laser diode, VCSEL, RF device, and Micro LED production.
• PKG (Packaging) Service Semiconductor packaging services completing QSI's integrated compound semiconductor manufacturing flow from EPI through FAB to PKG, available as a standalone service or as part of full vertical manufacturing.

Quantifiable outcome

• Overcoming Red Micro-LED Challenges via 3D Monolithic Integration Technology (2026)
• +3 more outcomes

Named customers30 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• IPG Photonics: A leading manufacturer of high-power fiber lasers, diode lasers, and laser-based systems for industrial and medical applications. Comparable to QSI in laser diode manufacturing for industrial end markets, though dominant in fiber laser technology.
• Trumpf: A leading laser technology and systems company that also produces direct diode lasers and semiconductor laser components. Comparable to QSI in laser diode supply for industrial applications, though broader in laser systems integration.
• Sony Semiconductor Solutions: Manufactures CMOS image sensors and is a major force in compound semiconductor and Micro LED development. Comparable to QSI's emerging Micro LED and VCSEL activities, though vastly larger scale and broader product portfolio.
• Coherent (formerly II-VI): A global compound semiconductor and laser materials/platform incumbent with broad exposure across VCSEL, laser diodes, and compound semi materials. Comparable to QSI's foundry and device portfolio but at significantly larger scale and broader product scope.
• Broadcom: Dominant supplier of VCSELs for 3D sensing applications in consumer electronics and adjacent markets. Comparable to QSI's VCSEL foundry and product development activities, though at vastly larger scale and with proprietary integration.
• Mitsubishi Electric: Manufactures semiconductor laser diodes and compound semiconductor devices for industrial, communications, and sensing applications. Comparable to QSI in laser diode product family, though as part of a much larger diversified industrial conglomerate.

Direct peers

• ams-OSRAM: A major manufacturer of LED and laser diode products including VCSEL, edge-emitting lasers, and Micro LED epi. Directly comparable to QSI across optoelectronic emitters and compound semiconductor device manufacturing.
• Hamamatsu Photonics: Specialized Japanese manufacturer of laser diodes, photonic devices, and optical sensors for industrial, medical, and scientific applications. Comparable to QSI in laser diode manufacturing focus and industrial customer base.
• Lumentum: A leading manufacturer of laser diodes, VCSELs, and photonic components for 3D sensing, LiDAR, and industrial applications. Directly comparable to QSI across VCSEL and laser diode product lines serving similar industrial and consumer end markets.

Emerging players

• Vertilite: A China-based VCSEL company serving 3D sensing, LiDAR, and consumer electronics applications. Comparable to QSI in VCSEL product focus but at smaller scale and with overlapping customer base in Asian consumer electronics.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/qsi-co-ltd

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about QSI