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(12)United States Patent Lee

(54) QUANTUM DOTS OF GROUP IV SEMICONDUCTOR MATERIALS

(75) Inventor: HowardWingHoonLee,Fremont,CA (Us)

(73) Assignee: UltraDots,Inc.,MenloPark,CA (US)

(*) Notice: Subjecttoanydisclaimer,thetermofthis patent is extended or adjusted under 35

U.S.C. 154(b) by 0days. (21) App1.No.:10/893,059

(10)PatentNo.: US 7,402,832B2

22 ( )

(65)

(62) (60)

(51)

(52) (58)

(56)

F1 d: 1e

J l.16 2004 “ ’

(Continued) FOREIGN PATENT DOCUMENTS

0 254 509 A1 V1988

(Continued)

OTHERPUBLICATIONS

Prior Publication Data US 2004/0262583A1 Dec.30,2004

Related US. Application Data

DivisionofapplicationNo.10/212,001,?ledonAug.

2’2002’now abandoned

ProvisionalapplicationNo.60/309,898,?ledonAug.

2,2001,provisionalapplicationNo.60/309,905,?led

on Aug. 2, 2001, provisional application No. 60/309, 979,?ledonAug.2,2001,provisionalapplicationNo. PrimaryExaminerileromeJackson,Jr,

60/310,090, ?led on Aug. 2, 2001, provisional appli- cation No. 60/310,095, ?led on Aug. 2, 2001.

Int.Cl.

H01L 29/16 (2006.01)

US. Cl. .. 257/17; 257/22; 257/E92797.>)871i

___

FieldofClassi?cationSearch .. 257/1272,

S1,_?lf1hh, eeapplcanon eorCompeteSeam lstory'

References Cited US. PATENT DOCUMENTS

3,995,311 A 11/1976 Taylor

108 106

(74) Azwrney, Agenz, 0r Firmicooley Godward Kronish LLP

(57) ABSTRACT

The invention relates to a quantum dot‘ The quantum dot

comprises a core including a semiconductor material Y SelectedfromthegroupConsistingofsiandGe'Thequantum

dot also comprises a shell surrounding the core. The quantum dot is substantially defect free such that the quantum dot

exhibitsphotoluminescenceWithaquantumef?ciencythatis greater than 10 percent.

8Claims,12DrawingSheets

104

EP

(45) Date of Patent:

Jul. 22, 2008

4,211,467 A 4,332,974 A 4,557,551 A 4,688,882 A 4,693,547 A 4,818,050 A 4,856,859 A 4,894,818 A 4,906,064 A 4,962,987 A 4,973,122 A

7/1980 Crosseta1.

6/1982 Fraas 12/1985 Dyott 8/1987 F?iles

9/1987 Sorefeta1. 4/1989 Duthie 8/1989 Imoto 1/1990 Fujiokaeta1. 3/1990 Cheung

10/1990 Doran 11/1990 Cottereta1.

US007402832B2

Bleyetal.,“Characterizationofsiliconnanoparticlespreparedfrom POrOuSSilicon,”Chem-Male/"-811881-1338,1996

(Continued)

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