Premium Yellow Phosphor
for High Efficiency Lighting
Complete yellow and yellow-green phosphor portfolio for white LED lighting, display backlighting, and signal applications. Ultra-high brightness YAG series with 110%+ relative intensity for demanding lighting applications.
White LED Lighting Challenges
Understanding the key technical challenges in white LED and general lighting applications
Luminous Efficiency
Achieving high lumen output while maintaining color quality is a constant challenge. Lower efficiency means higher power consumption and heat generation.
Thermal Stability
High-power LED applications require phosphors that maintain performance under elevated temperatures without degradation or color shift.
CCT Control
Precise correlated color temperature control from warm white (2700K) to cool white (7000K) requires careful phosphor selection and blending.
Package Compatibility
Different packaging formats require different particle sizes. SMD needs fine particles for flowability while high-power COB needs larger particles for settling stability.
Complete Yellow Phosphor Series
From ultra-fine yellow-green to large-particle YAG, covering all white LED applications
FL-4255 Ultra-Fine Yellow-Green
545nm peak · 110.01% intensity · Ultra-fine 5.0μm for precision SMD packaging
| Parameter | Spec Range | Measured | Notes |
|---|---|---|---|
| Peak Emission λ | 545±1 nm | 545 nm | Yellow-Green |
| Relative Intensity | 110±3% | 110.01% | Ultra High |
| CIE x Coordinate | 0.424±0.003 | 0.4255 | Precise |
| CIE y Coordinate | 0.550±0.003 | 0.5488 | Stable |
| D50 Particle Size | 5±0.5 μm | 5.0 μm | Ultra-Fine |
FL-4255 emission at 545nm falls in the peak human eye sensitivity region for maximum visual brightness
FL-4255 is the ideal choice for high-end display backlighting and traffic signals. The 545nm wavelength is near the peak of human eye sensitivity, delivering excellent visual brightness. Ultra-fine 5.0μm particle size provides exceptional dispersion for precision SMD packaging with superior flowability.
LD-4453S Precision Yellow-Green
557nm peak · 106.7% intensity · 7.58μm for Mini/Micro LED applications
| Parameter | Spec Range | Measured | Notes |
|---|---|---|---|
| Peak Emission λ | 557±1 nm | 557 nm | Yellow-Green |
| Relative Intensity | 103±3% | 106.7% | High |
| CIE x Coordinate | 0.448±0.003 | 0.4484 | Precise |
| CIE y Coordinate | 0.532±0.003 | 0.5311 | Stable |
| D50 Particle Size | 8±0.5 μm | 7.58 μm | Ultra-Fine |
LD-4453S features extremely narrow particle distribution (D10-D90 span ~5.6μm) for precision applications
LD-4453S is perfect for Mini LED, Micro LED, and fine-pitch displays. The extremely narrow particle distribution ensures consistent performance in precision dispensing applications. Ideal for machine vision lighting, AOI inspection, and high-end backlight modules.
YAG Series for SMD Packaging
455-460nm excitation · 108-114% intensity · 12.5μm standard for automated SMD
| Model | Peak λ | CCT | Intensity | D50 | Application |
|---|---|---|---|---|---|
| YAG-04H15 | 556.6nm | 3668K | 114.6% | 12.5μm | Highest Efficiency |
| YAG-04MBH | 557nm | 3579K | 109.35% | 12.5μm | General SMD |
| YAG-04H12 | 556nm | 3696K | 108.89% | 12.5μm | Yellow-Green Tint |
YAG series optimized for 455-460nm blue LED chips, providing warm white output with high efficiency
YAG-04H15 delivers the highest brightness at 114.6% — ideal for applications demanding maximum luminous efficacy. For general SMD lighting, YAG-04MBH offers excellent price-performance balance with 109.35% intensity. All 12.5μm products are optimized for automated dispensing processes.
YAG Series for High Power / COB
455-460nm excitation · 112%+ intensity · Large particles for settling stability
| Model | Peak λ | CCT | Intensity | D50 | Application |
|---|---|---|---|---|---|
| YAG-04H20 | 556.6nm | 3648K | 112.51% | 19.6μm | Ultra High Power |
| YAG-04H18 | 556.6nm | 3668K | 112.82% | 17.6μm | High Power COB |
Large particle YAG phosphors for high-power COB and module applications requiring stable settling
YAG-04H20 with 19.6μm is the largest particle in the series — designed for ultra-high-power COB modules where thick silicone layers require maximum settling stability to prevent color rings. YAG-04H18 at 17.6μm offers a balance between stability and flexibility for standard high-power applications.
Warm White Series (2700K-3500K)
470-478nm excitation · Wide spectrum FWHM · Incandescent-like warm tones
| Model | CCT | Peak λ | FWHM | Chip Match | Application |
|---|---|---|---|---|---|
| LD-5049 | 2700K | 574.2nm | 128.4nm | 475-478nm | Ultra Warm |
| LD-4949 | 3000K | 573.3nm | 127.5nm | 473-475nm | Natural Warm |
| LD-4850 | 3500K | 572.5nm | 125.7nm | 470-473nm | Warm White |
Ultra-wide FWHM (125-128nm) creates soft, full-spectrum warm white similar to incandescent bulbs
LD-5049 at 2700K delivers the warmest tone in the series — similar to traditional incandescent bulbs, perfect for bedrooms, hotels, and restaurants. LD-4949 at 3000K offers a natural warm white for general residential lighting. Note: These products are optimized for short-wavelength blue chips (470-478nm).
| Model | Peak λ | Intensity | D50 | CCT | Best For |
|---|---|---|---|---|---|
| FL-4255 | 545nm | 110.01% | 5.0μm | — | Display / Signal |
| LD-4453S | 557nm | 106.7% | 7.58μm | — | Mini/Micro LED |
| YAG-04H15 | 556.6nm | 114.6% | 12.5μm | 3668K | High Eff. SMD |
| YAG-04MBH | 557nm | 109.35% | 12.5μm | 3579K | General SMD |
| YAG-04H18 | 556.6nm | 112.82% | 17.6μm | 3668K | High Power |
| YAG-04H20 | 556.6nm | 112.51% | 19.6μm | 3648K | Ultra High Power |
| LD-5049 | 574.2nm | 80% | 7.01μm | 2700K | Ultra Warm |
Not Sure Which Model to Choose?
Our engineers can recommend the optimal phosphor based on your target CCT, CRI, efficiency, and packaging requirements.
Key Advantages
What sets our yellow phosphors apart from the competition
Industry-Leading Brightness
YAG-04H15 achieves 114.6% relative intensity — among the highest in the industry for white LED applications.
Complete Particle Size Range
From ultra-fine 5μm for precision SMD to large 19.6μm for high-power COB — one supplier for all your needs.
Full CCT Coverage
From 2700K ultra-warm to 7000K cool white, with optimized formulations for each color temperature range.
Free Recipe Design
Expert engineers provide customized phosphor blending recommendations to achieve your target specifications.
Where Our Yellow Phosphors Excel
Proven performance across demanding lighting and display applications
General Lighting
Indoor lighting fixtures, bulbs, ceiling lights, panel lights, downlights, and commercial lighting with high efficacy requirements.
Display & Backlighting
LCD backlight modules, LED displays, Mini/Micro LED, high color gamut displays, and precision indicator lights.
Traffic & Signal Systems
Traffic signal lights, highway signage, railway signals, aviation obstruction lights, and safety indicators.
High Power Lighting
Industrial high-bay lighting, street lights, flood lights, stadium lighting, and high-power LED modules.
Hospitality & Ambient
Hotel lighting, restaurant ambiance, residential warm lighting, and decorative applications requiring 2700-3500K.
Automotive Lighting
Interior cabin lighting, instrument panel backlighting, and automotive display applications.
Test Before You Commit
Request a free phosphor sample kit to evaluate luminous performance, CCT accuracy, and process compatibility in your production environment.
Consistent Quality You Can Trust
Strict quality control ensures batch-to-batch consistency
Every batch undergoes rigorous testing using HAAS-2000 fluorescence spectrometer and JX-1177 laser particle size analyzer. We guarantee CIE color coordinate deviation ≤0.003 and brightness variation ≤3% between batches. All products come with detailed COA and full traceability.
Ready to Boost Your LED Performance?
Contact us for free consultation and samples
Free Recipe Design
Our engineers design custom phosphor blends to achieve your target CCT, CRI, and efficiency specifications
Free Sample Testing
Evaluate our phosphors in your production environment before committing to volume orders
Fast Delivery
50-100g samples shipped worldwide within 3 business days with tracking
24h Response
Dedicated technical support team responds within 24 hours to all inquiries
Note: All technical data comes from HAAS-2000 fluorescence spectrometer and JX-1177 laser particle size analyzer standard testing. Application recommendations are based on reasonable inference from spectral characteristics. Contact our engineers for professional application solution design.