Phosphor Device with Movable Optical Transmitter for Spectral Control
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Solution Overview
Problem
Existing remote phosphor devices in lighting applications lack the ability to effectively tailor the spectral properties of wavelength-converted light, particularly in terms of color, color temperature, and color rendering, which limits their versatility in various lighting applications.
Innovation Solution
A phosphor device comprising a carrier member with a phosphor layer and a reflective zone, where the phosphor layer is subdivided into zones with adjustable proportions, allowing for the mixing of wavelength-converted light with directly reflected exciting light to achieve desired spectral properties, including color and color temperature, through the use of an optical transmitting member that can move relative to the phosphor and reflective zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single phosphor layer is used in remote phosphor devices, then the device structure is simple, but the ability to tailor spectral properties (color, color temperature, color rendering) is limited
Solution Approach 1:
The phosphor layer is divided into multiple phosphor zones (e.g., first phosphor zone, second phosphor zone) with different phosphor materials or compositions. Each zone can be independently controlled by separate exciting light sources or adjusted by moving the optical transmitting member, enabling independent control of different spectral components to achieve desired color, color temperature, and color rendering properties.
Solution Approach 2:
The optical transmitting member is made movable relative to the phosphor layers, allowing dynamic adjustment of which phosphor zones are irradiated and how much light is transmitted. This dynamic positioning enables real-time control of the spectral properties of the emitted light without changing the physical phosphor materials themselves.
2Ease of operation
If the optical transmitting member is fixed, then the device structure is simple, but the adjustment of spectral properties requires complex reconfiguration
Solution Approach 1:
The optical transmitting member is designed to be movable rather than fixed, allowing simple operational adjustment of spectral properties by repositioning the member to different locations over the phosphor zones. This dynamic element provides ease of operation while adding minimal complexity compared to complete reconfiguration systems.
3Adaptability or versatility
If all phosphor zones are always irradiated, then maximum light output is achieved, but spectral control flexibility is reduced
Solution Approach 1:
By making the optical transmitting member movable, the system can dynamically select which phosphor zones to irradiate at any given time. This allows optimization between spectral control flexibility and light output by positioning the transmitting member to cover specific zones based on the desired application requirements.
Solution Approach 2:
Different regions of the phosphor layer (different zones) have different local properties (different phosphor materials). The movable optical transmitting member allows selective irradiation of specific local regions, enabling tailored spectral output while maintaining the option to irradiate all zones for maximum light output when needed.
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
Enables precise adjustment of spectral properties, such as color and color temperature, of the emitted light, enhancing the versatility and efficiency of the lighting apparatus for applications like RGB projection and white light illumination.
Implementation Method 1
The phosphor is excited by exciting light, e.g. visible blue laser light (450 nm), impinging on the phosphor layer. The exciting laser light is wavelength-converted by the phosphor to generate light with longer wavelengths
Implementation Method 2
The reflective zone, however, reflects the exciting light without converting its wave-length
Data Source
AI summary
A phosphor device (1) comprising a carrier member (2) having upper and lower faces; a phosphor layer (3) being arranged at the upper face of the carrier member (2), whereby the phosphor layer (3) comprises at least one phosphor zone (R; G; Y); a reflective zone (33) being arranged adjacent to the at least one phosphor zone (R; G; Y); an optical transmitting member (4) having a first end face (7) and a second end face (9), the optical transmitting member (4) being arranged at the top portion of the phosphor layer (3) and the reflective zone (33), whereby wherein the first end face (7) of the optical transmitting member (4) covers at least a subarea (8) of each of the at least one phosphor zone (R; G; Y) and the reflective zone (33).