# US 11,306,898 B2 · Wavelength conversion element

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- Number: US 11,306,898 B2
- Document ID: US11306898B2
- Status: Granted
- Kind: B2
- Application number: 16/865,431
- Filed: 2020-05-04
- Published: 2021-07-01
- Granted: 2022-04-19
- Earliest claimed: 2019-12-26
- Assignees: Delta Electronics, Inc.
- Applicants: Delta Electronics, Inc.
- Inventors: Po-Tsun Kuo; Yen-I Chou
- Web page: https://patentgrep.com/patent/US11306898B2

## CPC

- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- C09K 11/7706: {Aluminates}
- F21V 7/30: the coatings comprising photoluminescent substances
- F21V 9/38: Combination of two or more photoluminescent elements of different materials
- H10K 50/856: comprising reflective means
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/08: containing inorganic luminescent materials
- H10K 50/86: Arrangements for improving contrast, e.g. preventing reflection of ambient light
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A wavelength conversion element includes a substrate, a reflective layer, an inorganic light luminescence layer and an organic light luminescence layer. The reflective layer is disposed over the substrate. The inorganic light luminescence layer is disposed over the reflective layer and includes a first fluorescent material. The organic light luminescence layer is disposed between the reflective layer and the inorganic light luminescence layer, and includes a second fluorescent material. A refractive index of the inorganic light luminescence layer is greater than that of the organic light luminescence layer, and a thickness of the inorganic light luminescence layer is greater than a thickness of the organic light luminescence layer.

## Claims

### Claim 1

A reflective wavelength conversion element, comprising:
a substrate;
a reflective layer over the substrate;
an inorganic light luminescence layer over the reflective layer, comprising a first fluorescent material; and
an organic light luminescence layer between the reflective layer and the inorganic light luminescence layer, comprising a second fluorescent material, wherein a refractive index of the inorganic light luminescence layer is greater than that of the organic light luminescence layer, and a thickness of the inorganic light luminescence layer is greater than a thickness of the organic light luminescence layer, and a peak wavelength of fluorescent light from the organic light luminescence layer is greater than that of the inorganic light luminescence layer.

### Claim 2 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein a concentration of the first fluorescent material of the inorganic light luminescence layer is in a range from 50 wt % to 100 wt %.

### Claim 3 (depends on 2)

The reflective wavelength conversion element of claim 2, wherein the inorganic light luminescence layer comprises a first glue binder made of glass, ceramic, or fluorescent ceramic.

### Claim 4 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein the organic light luminescence layer comprises a second glue binder and a fluorescent particle.

### Claim 5 (depends on 4)

The reflective wavelength conversion element of claim 4, wherein the second glue binder of the organic light luminescence layer is made of resin or silicone.

### Claim 6 (depends on 4)

The reflective wavelength conversion element of claim 4, wherein a concentration of the fluorescent particle of the organic light luminescence layer is in a range from 1 wt % to 88 wt %.

### Claim 7 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein the thickness of the inorganic light luminescence layer is in a range from 0.02 mm to 1 mm.

### Claim 8 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein the thickness of the organic light luminescence layer is in a range from 1 μm to 500 μm.

### Claim 9 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein the organic light luminescence layer further extends to a top surface of the inorganic light luminescence layer along a sidewall of the inorganic light luminescence layer.

### Claim 10 (depends on 9)

The reflective wavelength conversion element of claim 9, further comprising:
an anti-reflective coating film or a microstructure on the top surface of the inorganic light luminescence layer.

### Claim 11 (depends on 1)

The reflective wavelength conversion element of claim 1, wherein the organic light luminescence layer further comprises a white functional particle therein, and a refractive index of the white functional particle is greater than 1.7 and smaller than 3.

### Claim 12 (depends on 11)

The reflective wavelength conversion element of claim 11, wherein the white functional particle is made of Al2O3, TiO2, ZnO, ZrO2, or Ta2O5.