Optoelectronic Component with Spaced Organic Phosphor Solid Body
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Solution Overview
Problem
Conventional optoelectronic components, particularly LEDs, face stability issues due to the rapid aging of red organic phosphors when exposed to high blue light and elevated temperatures, leading to reduced lifespan.
Innovation Solution
An optoelectronic component design featuring a semiconductor chip with a first conversion layer containing inorganic phosphors and a solid body with organic phosphors, where the organic phosphor is spaced from the semiconductor chip by a carrier or conversion layer, reducing the intensity of primary radiation incident on the organic phosphor and preventing direct contact, thereby enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If organic phosphors are used in conventional optoelectronic components, then red light emission is achieved, but the phosphors age rapidly under high blue light exposure and elevated temperatures
Solution Approach 1:
The patent divides the phosphor system into two separate segments: inorganic phosphors (YAG:Ce, LuAG:Ce) placed close to the semiconductor chip for efficient blue light conversion, and organic phosphors (rhodamine, perylene derivatives) placed at a distance in a solid body. This segmentation allows each phosphor type to operate in its optimal environment, with organic phosphors exposed to reduced blue light intensity, thereby resolving the contradiction between achieving red light emission and maintaining phosphor stability.
Solution Approach 2:
The patent introduces an intermediary structure - a transparent or translucent solid body (encapsulant) that contains the organic phosphors and positions them at a distance from the semiconductor chip. This intermediary medium filters and diffuses the blue light before it reaches the organic phosphors, reducing the harmful radiation intensity while still allowing the organic phosphors to convert some blue light to red light, thus resolving the stability issue.
2Productivity
If organic phosphors are placed close to the semiconductor chip for efficient light conversion, then light output is improved, but radiation damage and aging increase
Solution Approach 1:
The patent applies local quality by creating different spatial zones with different phosphor concentrations and types. The region close to the semiconductor chip contains inorganic phosphors with high conversion efficiency, while regions at a distance contain organic phosphors protected from intense radiation. This spatial differentiation of phosphor properties allows the system to maintain high overall light output while protecting the vulnerable organic phosphors, resolving the contradiction between efficiency and lifespan.
Solution Approach 2:
The patent transitions from a two-dimensional planar phosphor layer to a three-dimensional distributed phosphor system. Organic phosphors are embedded throughout a volumetric solid body at various distances from the chip, creating a gradient of exposure conditions. This dimensional change allows efficient light conversion near the chip while providing protected zones farther away, thereby extending phosphor lifespan without sacrificing productivity.
3Reliability
If inorganic phosphors are used exclusively, then stability is improved, but the ability to generate red light is insufficient
Solution Approach 1:
The patent employs a composite phosphor system combining inorganic phosphors (YAG:Ce, LuAG:Ce) and organic phosphors (rhodamine, perylene derivatives) within the same optoelectronic component. The inorganic phosphors provide stable blue-to-yellow conversion, while the organic phosphors contribute additional red light emission. This composite approach leverages the strengths of both material types, achieving both high stability and sufficient red light output.
Solution Approach 2:
The patent makes the optoelectronic component multi-functional by incorporating phosphors with different emission characteristics. The inorganic phosphors handle the primary conversion task with high stability, while the organic phosphors supplement the red light output. This universal design allows a single component to achieve both stability and comprehensive spectral output, resolving the contradiction between reliability and red light intensity.
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 configuration extends the lifespan of organic phosphors by reducing exposure to intense radiation, leading to improved durability and performance of the optoelectronic component.
Implementation Method 1
a first conversion layer with an inorganic phosphor on the semiconductor chip. The inorganic phosphor is configured to convert the primary radiation into secondary radiation
Implementation Method 2
a solid body in which an organic phosphor is distributed. The organic phosphor is configured to convert the primary radiation and/or the secondary radiation into a tertiary radiation
Data Source
AI summary
An optoelectronic component and a lighting apparatus are disclosed. In an embodiment an optoelectronic component includes a carrier having an upper side and an underside opposite the upper side, an optoelectronic semiconductor chip arranged on the upper side of the carrier, the semiconductor chip configured to emit primary radiation during operation via one or more sides. The component further includes a first conversion layer having an inorganic phosphor on the semiconductor chip, the first conversion layer covering at least all radiation-emitting sides of the semiconductor chip not facing the carrier and a solid body in which an organic phosphor is distributed, wherein the solid body is arranged and fastened on the carrier and is at least in indirect contact with the carrier, and wherein the solid body is spaced from the radiation-emitting sides of the semiconductor chip at least by the first conversion layer and/or by the carrier.