Blue LED Phosphor Layer with Blue Pigment for Luminous Flux
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Solution Overview
Problem
Current blue light emitting LEDs have limited luminous flux, particularly in specific lighting applications, and there is a need to enhance this while maintaining saturated blue emission and desired chromaticity.
Innovation Solution
Incorporating a blue pigment into the phosphor layer of blue light emitting LEDs, in combination with a green luminescent material, to absorb part of the luminescent material light and increase luminous flux, while ensuring the light remains within the desired chromaticity zone for blue colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If green luminescent material is added to blue LED to increase luminous flux, then luminous flux is improved, but color saturation and chromaticity are worsened
Solution Approach 1:
The patent applies color changes by introducing a blue pigment into the phosphor layer to absorb the green light emitted by the luminescent material. This selective absorption transforms the spectral composition, removing the green component that degrades color saturation while preserving the blue emission. The pigment acts as a spectral filter that modifies the overall color output to maintain saturation within the desired chromaticity zone.
Solution Approach 2:
The blue pigment serves as an intermediary substance between the green luminescent material and the final light output. It mediates the interaction by absorbing the harmful green light while allowing the blue light to pass through, thus protecting the color saturation property. This intermediary approach allows the system to benefit from increased luminous flux without suffering from color degradation.
2Illumination intensity
If blue pigment is added to absorb green light, then color saturation is improved, but device complexity is worsened
Solution Approach 1:
The patent merges the blue pigment with the existing phosphor layer containing green luminescent material, creating a combined functional layer. Instead of adding a separate component or layer, the pigment is integrated into the phosphor matrix, simplifying the overall structure. This merging approach maintains color saturation improvement while avoiding increased device complexity.
Solution Approach 2:
The phosphor layer is given multiple functions: it continues to convert blue LED light to green light while simultaneously serving as a carrier for the blue pigment that absorbs the green light. This multi-functionality eliminates the need for separate absorption layers or components, reducing structural complexity while achieving the desired color saturation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves a luminous flux gain of over 20% for blue light emitting LEDs, maintaining saturated blue emission and staying within the required chromaticity zone, suitable for applications like blue emergency and decorative lighting.
Implementation Method 1
a luminescent material configured to convert part of the light source light into luminescent material light comprising green light
Implementation Method 2
a blue pigment configured to absorb part of the luminescent material light
Data Source
AI summary
The invention provides an LED package configured to generate blue LED package light, wherein the LED package comprises a solid state light source configured to generate blue light source light, a luminescent material configured to convert part of the light source light into luminescent material light comprising green light, and a blue pigment configured to absorb part of the luminescent material light.