# US 2018/0026150 A1 · Wavelength conversion member and photovoltaic device using same

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- Number: US 2018/0026150 A1
- Document ID: US20180026150A1
- Status: Published application
- Kind: A1
- Application number: 15/547,450
- Filed: 2015-12-16
- Published: 2018-01-25
- Earliest claimed: 2015-02-09
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Natsuki SATO
- Web page: https://patentgrep.com/patent/US20180026150A1

## CPC

- H10F 77/45: Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
- C09K 11/61: containing fluorine, chlorine, bromine, iodine or unspecified halogen elements
- C09K 11/616: {with alkali or alkaline earth metals}
- C09K 11/7733: {with alkali or alkaline earth metals}
- G02B 5/20: Filters (polarising elements G02B5/30)
- H10F 10/166: the Group IV-IV heterojunctions being heterojunctions of crystalline and amorphous materials, e.g. silicon heterojunction [SHJ] photovoltaic cells
- Y02E 10/52: PV systems with concentrators
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A wavelength conversion member (20) includes a fluoride phosphor (25) activated by Ce3+ or Eu2+. Then, with regard to the fluoride phosphor, internal quantum efficiency measured at 80° C. is 85% or more when internal quantum efficiency measured at 30° C. is taken as 100%. Moreover, a photovoltaic device includes the above-mentioned wavelength conversion member. The wavelength conversion member uses a fluoride phosphor, in which a decrease of the internal quantum efficiency is suppressed, and excellent temperature characteristics are imparted. Therefore, the wavelength conversion member can effectively utilize ultraviolet light even at high temperature, and it becomes possible to enhance an output of the photovoltaic device.

## Claims

### Claim at position 1

-6. (canceled)

### Claim 7

A wavelength conversion member comprising:
a fluoride phosphor activated by Ce3+ or Eu2+, the fluoride phosphor comprising, as a host, a compound represented by a general formula: M3Mg4F14, where M is alkaline earth metal,
wherein, with regard to the fluoride phosphor, internal quantum efficiency measured at 80° C. is 85% or more when internal quantum efficiency measured at 30° C. is taken as 100%.

### Claim 8 (depends on 7)

The wavelength conversion member according to claim 7, wherein a refractive index of the fluoride phosphor is 1.41 or more to less than 1.57.

### Claim 9 (depends on 7)

The wavelength conversion member according to claim 7, further comprising a sealing material which disperses the fluoride phosphor.

### Claim 10 (depends on 7)

A photovoltaic device comprising the wavelength conversion member according to claim 7.