# US 8,465,675 B2 · Encapsulation material

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- Number: US 8,465,675 B2
- Document ID: US8465675B2
- Status: Granted
- Kind: B2
- Application number: 12/979,158
- Filed: 2010-12-27
- Published: 2011-10-20
- Granted: 2013-06-18
- Earliest claimed: 2010-04-14
- Assignees: Industrial Technology Research Institute
- Applicants: Min-Tsung Kuan; Ming-Chia Li; Wen-Hsien Wang; Kuo-Chan Chiou; Tzong-Ming Lee; Fang-Yao Yeh
- Inventors: Min-Tsung Kuan; Ming-Chia Li; Wen-Hsien Wang; Kuo-Chan Chiou; Tzong-Ming Lee; Fang-Yao Yeh
- Web page: https://patentgrep.com/patent/US8465675B2

## CPC

- C09K 11/06: containing organic luminescent materials
- H10F 19/804: {Materials of encapsulations}
- H10F 77/45: Wavelength conversion means, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
- C09K 2211/1416: Condensed systems
- C09K 2211/1466: containing nitrogen as the only heteroatom
- Y02E 10/52: PV systems with concentrators
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed are encapsulation materials including an 80 to 99.5 weight percentage (wt %) of ethylene vinyl acetate copolymers (EVA) and a 0.5 to 20 weight percentage(wt %) of a photoluminescent polymer, wherein the EVA and the photoluminescent polymers are evenly blended. The encapsulation materials can be applied to packaging solar cells, and the encapsulating structure may protect the EVA from UV damage and enhance light utilization efficiency of the solar cell.

## Claims

### Claim 1

An encapsulation material, comprising:
an 80 to 99.5 weight percentage (wt %) of an ethylene vinyl acetate copolymer (EVA); and
a 0.5 to 20 weight percentage (wt %) of a photoluminescent polymer, wherein the EVA and the photoluminescent polymer are evenly blended;
wherein the photoluminescent polymer has the general formula as follows:
wherein D is a photoluminescent group;
R1, R2, and R3 are independently selected from hydrogen, a substituted C1-6 alkyl group, or an unsubstituted C1-6 alkyl group;
R4 is a substituted C1-6 alkylenyl group or an unsaturated C1-6 alkylenyl group;
m is an integer of 1 to 5; and
n is 10 to 10,000.

### Claim 2 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the EVA has a number-average molecular weight (Mn) of 5,000 to 100,000.

### Claim 3 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the photoluminescent group of the photoluminescent polymer absorbs UV radiation having a wavelength of less than 400 nm to emit a visible light having a wavelength greater than 400 nm, and wherein the visible light includes a fluorescence or a phosphorescence light.

### Claim 4 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the photoluminescent polymer has a number-average molecular weight (Mn) of 5,000 to 100,000.

### Claim 5 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the photoluminescent polymer has a refractive index of 1.2 to 1.7.

### Claim 6 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the photoluminescent polymer has a melting point of 50° C. to 130° C.

### Claim 7 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the photoluminescent group is a pyrenyl group, an anthracenyl group, a naphthalenyl group, a flavonyl group, a coumarinyl group, a perylenyl group, a carbazole group, derivatives thereof, or combinations thereof.

### Claim 8 (depends on 1)

The encapsulation material as claimed in claim 1, wherein the ethylene vinyl acetate copolymer is copolymerized from an ethylene monomer and a vinyl acetate monomer, and the ethylene monomer and the vinyl acetate monomer have a molar ratio of 60:40 to 80:20.

### Claim 9 (depends on 1)

The encapsulation material as claimed in claim 1, further comprising a 0.1 to 5 weight percentage (wt %) of an additive.

### Claim 10 (depends on 9)

The encapsulation material as claimed in claim 9, wherein the additive comprises a resin accelerator, a thermal stabilizer, or combinations thereof.

### Claim 11 (depends on 10)

The encapsulation material as claimed in claim 10, wherein the resin accelerator comprises a benzoyl peroxide, a dicummyl peroxide, a 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, a 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane, or combinations thereof.

### Claim 12 (depends on 10)

The encapsulation material as claimed in claim 10, wherein the thermal stabilizer comprises a butylhydroxytoluene, a bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, or combinations thereof.

### Claim 13

A solar cell encapsulating module, comprising:
an encapsulation material comprising:
an 80 to 99.5 weight percentage (wt %) of an ethylene vinyl acetate copolymer (EVA); and
a 0.5 to 20 weight percentage (wt %) of a photoluminescent polymer, wherein the EVA and the photoluminescent polymer are evenly blended;
wherein the photoluminescent polymer has the general formula as follows:
wherein D is a photoluminescent group;
R1, R2, and R3 are independently selected from hydrogen, a substituted C1-6 alkyl group, or an unsubstituted C1-6 alkyl group
R4 is a substituted C1-6 alkylenyl group or an unsaturated C1-6 alkylenyl group;
m is an integer of 1 to 5; and
n is 10 to 10,000.

### Claim 14 (depends on 13)

The solar cell encapsulating module of claim 13, further comprising:
a first substrate having a first layer of the encapsulating material formed on a surface thereof;
a second substrate having a second layer of the encapsulating material formed on a surface thereof, arranged such that the first layer and the second layer are facing each other; and
a solar cell disposed between the first layer and the second layer.