New LED Chip Design Boosts Color Accuracy Energy Savings

In professional lighting applications such as sports stadiums and ultra-high-definition television (UHDTV) production, there exists an inherent trade-off between color rendering capability and luminous efficacy. Traditional blue LED chips with yellow phosphor (1B-Y) configurations can achieve high energy efficiency of 133 lm/W, but suffer from poor color accuracy with a Color Rendering Index (CRI) of just 77. Particularly problematic is the R9 (red rendering) value of -7, which causes significant color distortion unsuitable for professional applications. The key technological challenge lies in achieving full-spectrum color fidelity while maintaining high energy efficiency.

A groundbreaking solution has emerged through a novel multi-chip integrated packaging (PKG) architecture. This design combines an ultraviolet (UV) chip with dual blue chips in a compact 5.0 mm × 5.4 mm × 1.2 mm package. The configuration features a centrally positioned UV chip flanked by two symmetrically arranged blue chips in a "3-in-1" layout. This arrangement not only optimizes light distribution but also incorporates an integrated thermal management system that effectively dissipates heat from multiple chips, ensuring long-term stability under high operational loads.

The research team achieved remarkable results through precise wavelength tuning and phosphor formulation:

• Spectral Compensation: A 417 nm UV chip excites green phosphor to produce 470 nm supplemental light, significantly improving critical color metrics like R12 and addressing saturation deficiencies in conventional solutions.
• Performance Synergy: Comparative testing between PKG-1 (452 nm blue) and PKG-2 (455 nm blue) revealed that the 455 nm blue/417 nm UV combination delivers CRI ≥95 while maintaining approximately 100 lm/W luminous efficacy.
• Comprehensive Evaluation: Beyond standard CRI metrics, the solution was assessed using the TM-30 color fidelity standard. Results demonstrated exceptional performance across 99 color samples with chroma shift limited to under 7%, indicating superior color consistency.

The new LED package demonstrated outstanding robustness in extreme condition testing. After 1,000 hours of continuous operation in environments ranging from 298K to 378K with 85% humidity, the luminous flux maintained 99.7% of initial output. At 25 mA operating current, the solution consumes just 69 mW—an improvement over the 71.3 mW required by traditional 1B-Y configurations. This achievement represents a triple optimization of high color accuracy, high energy efficiency, and low power consumption, establishing a compelling technical pathway for high-performance lighting applications.