[Nationstar increases knowledge] Good quality can withstand the scrutiny of

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In the LED industry, “high luminous efficiency” and “long life” are every company’s commitment to customers. However, as LEDs develop towards high power and miniaturization, thermal management has become the most difficult and critical problem.

01

Heat is the invisible culprit

When LEDs work, most of the electricity does not turn into light, but into heat - usually 60% to 70% of the electricity is converted into heat.

The accumulation of heat will cause the LED to "fever", resulting in brightness attenuation, color drift, and premature damage. Every time the temperature rises by 10°C, the life of the LED is shortened by half. It can be said that the root cause of many quality problems is the failure to manage "heat".

Based on the deep understanding of this pain point, Nationstar Optoelectronics conducts thermal resistance testing throughout the entire life cycle of product development, mass production, and failure analysis, and uses precise data to protect the thermal reliability of each LED product.

Thermal resistance tester temperature control platform. 02

What is thermal resistance test

Thermal resistance test, simply put, is to see how the heat travels when it is conducted inside the LED, where it travels smoothly, and where it gets stuck.

Nationstar Optoelectronics adopts a transient thermal test method: by applying precise electrical signals to the device, the junction temperature changes are recorded at microsecond speed, and then the complete path of heat from the chip to the outside is deduced through algorithms. Just like doing a thermal CT for an LED, engineers can clearly distinguish the thermal resistance distribution of the chip layer, solid crystal layer, substrate layer, and heat sink layer. It is clear at a glance where there is congestion and where there is smooth flow. This non-destructive technology is known as the "gold standard" in LED thermal reliability testing.

Structural function curve and corresponding layering

03

Full link control

At Nationstar Optoelectronics, thermal resistance testing is not a "check once before leaving the factory", but the main line of quality throughout the entire product life cycle:

1. R&D stage: Evaluate the heat dissipation capabilities of different packaging structures and materials. The structure function curve generated by the tester helps us accurately locate the thermal bottleneck and thermal margin.

2. Engineering verification: Compare thermal resistance data under different batches and process parameters, select the best process window, and ensure that mass-produced products are "naturally good at dissipating heat."

3. Quality analysis: The thermal resistance of samples returned by customers is retested and compared with the factory data. How much does the thermal resistance increase? Where has the structure function changed? It can accurately determine whether it is interface degradation, material fatigue or process deviation. The root cause of the disease can be found without destroying the sample.

Comparison of structure functions of different interface states

04

Multi-dimensional detection capabilities

Thermal resistance testing is only part of the quality system of Nationstar Optoelectronics Analysis and Testing Center. Nationstar Optoelectronics has built multi-level and all-round support capabilities:

●Photoelectric performance testing (all bands from infrared to ultraviolet)

●Material analysis and failure diagnosis (scanning electron microscope, X-ray, ultrasonic scanner, etc.)

●Environment and reliability testing (high temperature and humidity, hot and cold shock, temperature cycle, etc.)

Photoelectric performance testing

Materials and failure diagnosis

Environmental reliability testing

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HUANYING

No. 18, Huabao South Road, Chancheng District, Foshan City

In the LED industry, prices are comparable and brightness is measurable, but what truly distinguishes a company from "making products" or "making high-quality products" are often invisible capabilities - thermal management capabilities are one of them. Good quality can withstand the test of light, and even more so, the scrutiny of heat.