As LED lighting technology rapidly advances toward high power and high density, the optical performance and reliability of encapsulation materials have become key factors constraining product performance. IOTA LEDH 3220, a high refractive index phenyl-type LED encapsulant launched by IOTA SILICONE OIL ANHUI CO.,LTD. (hereinafter referred to as "IOTA"), has been successfully applied in multiple high-power LED packaging projects. Thanks to its excellent optical properties, heat resistance, and anti-sulfuration capabilities, it helps customers significantly improve light extraction efficiency and extend product lifespan.
IOTA LEDH 3220 is a two-component addition-cure silicone material designed by IOTA specifically for high-power LED packaging. Utilizing phenyl modification technology, it features the following core technical parameters:
| Performance Index | Typical Data |
|---|---|
| Refractive Index (25℃) | 1.54 |
| Light Transmittance | ≥92% |
| Hardness (Shore D) | 52° |
| Tensile Strength | 8 MPa |
| Elongation | 40% |
| Viscosity of Part A (25℃) | 4500 mPa·s |
| Viscosity of Part B (25℃) | 6000 mPa·s |
| Mixing Ratio | 1:5 (by weight) |
| Curing Conditions | 100℃/1h + 150℃/3h |
| Water Vapor Transmission Rate | 5.70 g/m²·24h |
| Coefficient of Linear Expansion | 170 ppm |
This product is particularly suitable for high-power SMD (Surface Mount Device) LED packaging. It offers excellent anti-sulfur and heat-resistant properties, maintaining long-term stability in high-temperature, high-humidity, and sulfur-containing environments, effectively preventing LED devices from light decay caused by material yellowing or cracking.
1. Enhancing Light Extraction Efficiency and Reducing Optical Loss
During the operation of high-power LEDs, light emitted from the chip undergoes total reflection at the interface between the chip and the encapsulant, causing some light to be trapped. With a refractive index of 1.54, IOTA LEDH 3220 effectively reduces the refractive index mismatch at the interface, allowing more light to pass through smoothly. According to industry research, using high refractive index encapsulants can increase the brightness of LED devices by 15%-30% while maintaining excellent color consistency [1][2].
2. Excellent Heat Resistance and Anti-Aging Performance
High-power LEDs generate substantial heat during operation, which can cause ordinary encapsulants to yellow or crack in high-temperature environments. IOTA LEDH 3220 utilizes a phenyl-modified silicone resin system, capable of long-term stable operation in a temperature range of -30℃ to 200℃. When combined with IOTA AM Methyl Vinyl MQ Silicone Resin as a reinforcing material, it further enhances mechanical strength and weather resistance, achieving a light transmittance of over 98% [3].
3. Outstanding Anti-Sulfuration Performance for Harsh Environments
In sulfur-containing environments (such as near rubber products or industrial exhaust), ordinary LED encapsulants are prone to sulfuration reactions that lead to blackening and failure. IOTA LEDH 3220 features excellent anti-sulfur performance, making it highly suitable for harsh application scenarios like outdoor lighting, automotive lighting, and industrial lighting.
To meet different LED packaging needs, IOTA provides a comprehensive encapsulation material solution:
According to the "2026-2032 Global and China Silicone-based LED Encapsulation Materials Market Research and Forecast Trend Report" published by CRI (China Research and Intelligence), silicone-based LED encapsulation materials have become the preferred choice for harsh application scenarios such as automotive lights, outdoor lighting, and UV LEDs. This is due to their excellent UV aging resistance, wide-temperature-range elasticity retention (-50℃ to 200℃), low yellowing rate, and high light transmittance [4].
With the rise of Mini-LED and Micro-LED technologies, there are higher requirements for the fluidity, curing shrinkage, and interface matching of encapsulants. IOTA continues to increase R&D investment to develop new encapsulation materials with precise rheological control, defect-free filling capabilities, and rapid curing characteristics, meeting the packaging demands for high-density, small-size chips [5].
IOTA LEDH 3220 has passed validation tests by multiple LED packaging enterprises, demonstrating outstanding performance in the following areas:
IOTA's technical support team provides customers with full-process technical services ranging from material selection and process optimization to failure analysis, helping clients rapidly achieve product upgrades.
IOTA SILICONE OIL ANHUI CO.,LTD. is a high-tech enterprise focused on the R&D, production, and sales of specialty silicone materials. Its product portfolio covers silicone oils, silicone resins, silanes, LED encapsulants, high-temperature adhesives, and more. Adhering to the philosophy of "Technological Innovation, Quality First," IOTA is committed to providing customers with high-performance, high-reliability silicone solutions.
Product Inquiries & Technical Support: zyf@siliconeoil.cn
References:
[1] Shenzhen Xinruida Technology Co., Ltd. High Refractive Index Encapsulant for High-Power LED: An Innovative Material Lighting up the Future. Bafang Resource Network, April 2026.
[2] CRI (China Research and Intelligence). 2026-2032 Global and China Silicone-based LED Encapsulation Materials Market Research and Forecast Trend Report. April 2026.
[3] IOTA SILICONE OIL ANHUI CO.,LTD. Product Datasheet for IOTA AM Methyl Vinyl MQ Silicone Resin. 2026.
[4] CRI (China Research and Intelligence). Silicone-based LED Encapsulation Materials are Key Components for High-Power and High-Reliability LED Devices. April 2026.
[5] CRI (China Research and Intelligence). 2025-2031 Global and China LED Filling Adhesive Market Research and Forecast Trend Report. January 2026.
Disclaimer: The product performance data mentioned in this article are typical values. Please refer to IOTA's official technical documents for specific specifications. Actual application effects may vary due to process conditions, usage environments, and other factors. It is recommended that customers conduct sample testing and validation before use.
