Optoelectronic Component Phosphor Wavelength Conversion
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Solution Overview
Problem
Existing optoelectronic components with semiconductor chips emitting in the blue spectral range face a decrease in radiation power as wavelength increases, limiting their luminous flux and efficiency.
Innovation Solution
Incorporating a phosphor that converts primary blue radiation into longer-wave green radiation, enhancing the luminous flux of the mixed light by up to 130% by adjusting the dominant wavelength to the 460-480 nm range, achieved through various configurations such as surrounding the semiconductor chip, applying a phosphor layer, or using a phosphor in the exit window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If semiconductor chips emit electromagnetic radiation in the blue spectral range with longer wavelength to achieve high lumen values, then luminous flux is improved, but radiation power decreases greatly
Solution Approach 1:
The patent applies parameter changes by selecting specific dominant wavelengths for the semiconductor chip (less than 465 nm, preferably 440-455 nm) and controlling the phosphor's conversion characteristics to emit at 490-550 nm. By optimizing these wavelength parameters and the phosphor conversion efficiency, the system achieves high luminous flux while maintaining sufficient radiation power through precise spectral parameter control
Solution Approach 2:
The patent uses composite materials by combining the semiconductor chip with a phosphor layer that converts part of the blue radiation into green radiation. This composite structure creates a mixed light output that leverages both the high radiation power of short-wave blue emission and the high luminous efficiency of green emission, resolving the contradiction between power and luminous flux
2Illumination intensity
If a phosphor converts primary radiation into longer-wave secondary radiation to increase luminous flux, then luminous flux is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the semiconductor chip and phosphor into a closely integrated structure where the phosphor is applied directly on or around the chip's radiation exit area. This merging approach allows the phosphor to be excited directly by the chip's radiation, achieving high luminous flux while minimizing structural complexity through direct integration rather than separate components
Solution Approach 2:
The phosphor acts as an intermediary that converts the semiconductor chip's primary blue radiation into a mixed spectrum including green radiation. This intermediary function enables the system to achieve high luminous flux by converting energy from one form to another, adding functional complexity without significantly increasing structural complexity
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
The solution significantly increases luminous flux and uniformity of the emitted radiation, allowing for a broader application range and reduced production costs by optimizing the dominant wavelength distribution and phosphor efficiency.
Implementation Method 1
the phosphor converts at least part of the primary radiation into a longer-wave secondary radiation in a green spectral range
Implementation Method 2
the phosphor includes an electrophoretically deposited phosphor layer applied on a radiation exit area of the semiconductor chip
Data Source
AI summary
An optoelectronic component includes a semiconductor chip that emits a primary radiation in the short-wave blue spectral range at a dominant wavelength of less than approximately 465 nm; and a phosphor that converts at least part of the primary radiation into a longer-wave secondary radiation in the green spectral range at a dominant wavelength of between approximately 490 nm and approximately 550 nm and at least partly surrounds the semiconductor chip, wherein a mixed light composed of primary radiation and secondary radiation has a dominant wavelength at wavelengths of approximately 460 nm to approximately 480 nm such that a luminous flux of the mixed light is up to 130% greater than a luminous flux in an optoelectronic component without a phosphor having the same dominant wavelength in a range of 460 nm to 480 nm, and the phosphor is arranged in a lamina that bears directly on the semiconductor chip.