Microtech 근적외선·중적외선 LED 

가스·액체·고체 성분 분석용 1.0–5.0 µm 적외선 센싱 광원 

(Microtech) 

Microtech의 근적외선·중적외선 LED는 1.0–2.5 µm 근적외선(NIR)과 2.8–5.0 µm 중적외선(MIR) 영역을 지원하는 소형 반도체 광원으로, 가스·액체·고체 성분 분석 및 다양한 센싱 응용에 적합한 제품군입니다. 0.35 × 0.35 mm의 컴팩트한 LED 칩 구조를 기반으로 낮은 소비전력, 빠른 응답 속도, 최대 100 MHz 수준의 변조 가능성, 최대 +150°C 동작 온도, 80,000시간 수명 등의 장점을 제공하며, LED 방출 대역폭이 여러 화학 물질의 흡수 대역폭과 유사해 별도의 광학 필터 없이도 선택적 검출 시스템을 구성할 수 있습니다. 또한 단일 파장 LED뿐 아니라 다중 요소 어레이 구성이 가능해 하나의 소형 패키지 안에서 다파장 센싱 광원을 구현할 수 있으며, 특수 유리 커버 모델은 기존 대비 3–5배 향상된 광출력을 제공해 보다 높은 정확도가 필요한 분석 장비에 적합합니다. TO-18, TO-5, TO-8 및 SMD 패키지 등 다양한 패키지 옵션과 QCW·펄스 구동 모드를 지원하므로, 휴대형 분석기, 산업용 가스 센서, 분광 기반 계측 장비, 화학·환경 모니터링 시스템에 유연하게 통합할 수 있는 근적외선·중적외선 LED 솔루션입니다.

특징

•  - 1000–2500 nm 근적외선 LED 및 2800–5000 nm 중적외선 LED 지원
   - 0.35 × 0.35 mm 초소형 LED 칩 기반의 컴팩트 광원 설계
   - 다중 소자 어레이 구성을 통한 단일 패키지 내 다파장 LED 구현 가능
   - 별도 광학 필터 없이 다양한 화학 물질 흡수 대역에 대응 가능
   - 센싱 응용 분야에 적합한 높은 선택도와 측정 정확도 제공
   - 1 mW 미만의 저전력 구동으로 효율적인 시스템 통합 가능
   - 10–50 ns의 짧은 응답 시간 지원
   - 최대 100 MHz 변조 범위 구현 가능
   - 최대 +150°C 동작 온도를 지원하는 고온 안정성
   - 80,000시간 수명의 장수명 적외선 LED 솔루션

제품 사양

LED Models

• 1 Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%
• 2 Repetition rate: 0.5 kHz, pulse duration: 20 µs, duty cycle: 1%
• 3 Parameter tested for representative sampling; all other parameters tested for each device
• 4 Temperature range may vary for different packaging types

• 1 Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%
• 2 Repetition rate: 0.5 kHz, pulse duration: 20 µs, duty cycle: 1%
• 3 Parameter tested for representative sampling; all other parameters tested for each device
• 4 Temperature range may vary for different packaging types

LED models with glass covering

 Microtech BG is glad to announce new light-emitting diodes with special glass covering with increased LED output optical power (up to 3-5 times). This allows obtaining higher accuracy in different gas, liquids and solids sensing and analysis applications. Together with other advantages (compact size, low power consumption, high modulation range) our LEDs become even more impressive element base for sensors and analysers.

The following models are available:

• 1 Repetition rate: 0.5 kHz, pulse duration: 1 ms, duty cycle: 50%
• 2 Repetition rate : 0.5 kHz, pulse duration: 20 µs, duty cycle: 1%
• 3 Parameter tested for representative sampling; all other parameters tested for each device
• 4 Temperature range may vary for different packaging types

LED chip design

Standard Mid Infrared LED chip

This shape of the LED chip is typical for most of LED Microsensor NT standard LED models (Lms XX LED series).

Main features of standard packaging are:

• Small size of the LED chip (close to point source);
• Effective heat dissipation from the active layer;
• Uniform current distribution in the active region;
• Cost effective (due to small size).

Package for LEDs

Generally LEDs are mounted in the package that provides two electrical leads, a transparent optical window for the emission and heat-sinking. An LED chip is soldered/glued to the package surface that is connected to the one of the lead wires. Top contact of the chip is connected to the other lead with a bonding wire.

We offer a range of standard and customized TO- and SMD-type packages: 

TO-18 – for mounting one-element LEDs, single-wavelength matrices, 2-wavelength matrices

TO-18 with cap with glass window	TO-18 with cap without window	TO-18 with parabolic reflector  with quartz/sapphire window	TO-18 with parabolic reflector without window
Technical Drawing	Technical Drawing	Technical Drawing	Technical Drawing

TO5 (TO39) – for mounting one element LEDs or LED-matrices 

TO-5 with built-in TEM covered by cap with quartz/sapphire window	TO-5 with built-in TEM covered by parabolic reflector with quartz/sapphire window
Technical Drawing	Technical Drawing

TO8 – for mounting multi-element LED-matrices 

TO-5 with built-in TEM covered by cap with quartz/sapphire window

SMD type packages

CS3020 (SMD 3x2 mm)	CS35 (SMD 3.5x3.5 mm)	CS5-3M (SMD 5x5 mm) (for three-element LED matrices)

Temperature dependences

It is typical for all semiconductor radiation sources to have intensity decreasing with increasing temperature. This decrease of the emission intensity is due to several temperature-dependent factors including non-radiative recombination via deep levels, surface recombination, and carrier loss over heterostructure barriers. In addition to this peak wavelength shifts to longer wavelength when the temperature increases.

Housing LED chip into a package with a thermoelectric module (Peltier element) enables to obtain fixed temperature of a LED chip in a wide range and thereby to provide wavelength tuning and stabile operating at the desired wavelength.

Our LEDs can operate in wide temperature range, so that certainly broadens their field of application. As an example the spectra of Lms43LED within 1-120°C temperature range are presented here.

Beam divergence

LEDs in TO-18 package with a cap

LEDs in TO-18 package with a parabolic reflector

LEDs in SMD packages

Note! All the intensity values are arbitrary; the values from the different diagrams are incomparable.

LED Operation modes

LEDs offer numerous benefits due to possibility of different operation modes. Optical parameters of light emitting diodes strongly depend on the operation regime that you choose.

There are two main ways to drive LEDs: quasi continuous-wave mode (QCW) and pulse mode.

QCW means that an LED is switched on only for certain time intervals, which are short enough to reduce thermal effects significantly, but still long enough that the LED process is close to steady state. We recommend using pulse modes with duty cycle 50% or 25% to receive maximum average power. These modes provide signal modulation at certain frequency and allow obtaining higher output intensity than in case of using hard CW (continuous wave) mode. Therefore hard CW is not recommended.

Pulse mode with short pulse time (less than 50 ms) helps obtaining the maximum peak power.

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