JP7616201B2 - 表面に結合しているハロゲン化亜鉛及びカルボン酸亜鉛を含むコア-シェル型ナノ構造体 - Google Patents
表面に結合しているハロゲン化亜鉛及びカルボン酸亜鉛を含むコア-シェル型ナノ構造体 Download PDFInfo
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- JP7616201B2 JP7616201B2 JP2022501284A JP2022501284A JP7616201B2 JP 7616201 B2 JP7616201 B2 JP 7616201B2 JP 2022501284 A JP2022501284 A JP 2022501284A JP 2022501284 A JP2022501284 A JP 2022501284A JP 7616201 B2 JP7616201 B2 JP 7616201B2
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- 229910052725 zinc Inorganic materials 0.000 title claims description 62
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- 239000000203 mixture Substances 0.000 claims description 63
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- 239000011669 selenium Substances 0.000 claims description 35
- CCCMONHAUSKTEQ-UHFFFAOYSA-N octadec-1-ene Chemical compound CCCCCCCCCCCCCCCCC=C CCCMONHAUSKTEQ-UHFFFAOYSA-N 0.000 claims description 34
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- PRAKJMSDJKAYCZ-UHFFFAOYSA-N dodecahydrosqualene Natural products CC(C)CCCC(C)CCCC(C)CCCCC(C)CCCC(C)CCCC(C)C PRAKJMSDJKAYCZ-UHFFFAOYSA-N 0.000 claims description 21
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- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 18
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 claims description 16
- RZJRJXONCZWCBN-UHFFFAOYSA-N octadecane Chemical compound CCCCCCCCCCCCCCCCCC RZJRJXONCZWCBN-UHFFFAOYSA-N 0.000 claims description 16
- BGHCVCJVXZWKCC-UHFFFAOYSA-N tetradecane Chemical compound CCCCCCCCCCCCCC BGHCVCJVXZWKCC-UHFFFAOYSA-N 0.000 claims description 16
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Description
(a)不活性雰囲気下において、溶媒中のコア-シェル型ナノ構造体をカルボン酸亜鉛及びハロゲン化亜鉛と混合することと;
(b)(a)の混合物の温度を約90℃~約350℃の間の温度まで昇温することと;
(c)その表面に結合している酢酸亜鉛及びフッ化亜鉛を有するコア-シェル型ナノ結晶を単離することと;
を含む方法も提供する。
(d)不活性雰囲気下において、溶媒、配位子、及び塩化亜鉛を含む溶液にInPコアを約80℃~約150℃の温度で添加することと;
(e)(d)で得られた溶液に臭化亜鉛及び塩化ガリウムを添加することと;
(f)(e)で得られた溶液にセレン源を添加することと;
(g)(f)で得られた溶液を約150℃~約340℃の温度に加熱することと;
(h)(g)で得られた溶液を放冷することと;
により得られる。
(a)本明細書に記載するナノ構造体の少なくとも1つの集団と;
(b)少なくとも1種の有機樹脂と;
を含む、ナノ構造体フィルムも提供する。
(a)第1導電層と;
(b)第2導電層と;
(c)第1導電層及び第2導電層の間のナノ構造体層と;
を備え、ナノ構造体層は、本明細書に記載するナノ構造体の集団を含む、ナノ構造体成形品も提供する。
[0049] 幾つかの実施形態において、本開示は、酢酸亜鉛及びフッ化亜鉛で表面処理されたコア-シェル型ナノ構造体を含むナノ構造体組成物を提供する。
[0052] 本発明に使用するための量子ドット(又は他のナノ構造体)は、任意の好適な材料、好適には無機材料、より好適には無機導電性又は半導体材料から製造することができる。好適な半導体材料としては、第II-VI族、第III-V族、第IV-VI族、及び第IV族半導体を含む任意の種類の半導体が挙げられる。好適な半導体材料としては、これらに限定されるものではないが、Si、Ge、Sn、Se、Te、B、C(ダイヤモンドを含む)、P、BN、BP、BAs、AlN、AlP、AlAs、AlSb、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、ZnO、ZnS、ZnSe、ZnTe、CdS、CdSe、CdSeZn、CdTe、HgS、HgSe、HgTe、BeS、BeSe、BeTe、MgS、MgSe、GeS、GeSe、GeTe、SnS、SnSe、SnTe、PbO、PbS、PbSe、PbTe、CuF、CuCl、CuBr、CuI、Si3N4、Ge3N4、Al2O3、Al2CO、及びこれらの組合せが挙げられる。
[0060] シェルを作製するための例示的な材料としては、これらに限定されるものではないが、Si、Ge、Sn、Se、Te、B、C(ダイヤモンドを含む)、P、Co、Au、BN、BP、BAs、AlN、AlP、AlAs、AlSb、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、GaSb、ZnO、ZnS、ZnSe、ZnTe、CdS、CdSe、CdSeZn、CdTe、HgS、HgSe、HgTe、BeS、BeSe、BeTe、MgS、MgSe、GeS、GeSe、GeTe、SnS、SnSe、SnTe、PbO、PbS、PbSe、PbTe、CuF、CuCl、CuBr、CuI、Si3N4、Ge3N4、Al2O3、Al2CO、及びこれらの組合せが挙げられる。
[0070] 幾つかの実施形態において、本発明は、コア/シェル型InP/ZnSeナノ構造体の製造方法であって:
(a)In源、P源、亜鉛源、及びセレン源を混合することと;
(b)(a)の混合物の温度を約200℃~約350℃の間の温度まで昇温することと;
を含み、それによりナノ構造体を得る、方法に関する。
[0081] 幾つかの実施形態において、本発明は、コア/シェル型InP/ZnSeナノ構造体の製造方法であって:
(a)亜鉛又はセレンシェル前駆体及び溶媒を混合することと;
(b)(a)の混合物の温度を約50℃~約250℃の間の温度に昇温、降温、又は維持することと;
(c)InPコア及び亜鉛又はセレンシェル前駆体を(b)の混合物に添加することと;
を含み、それによりInP/ZnSeナノ構造体を得る、方法に関する。
[0101] 幾つかの実施形態において、本発明は、コア/シェル型InP/ZnSeナノ構造体の製造方法であって:
(a)不活性雰囲気下において、溶媒、配位子、及び塩化亜鉛を含む溶液に、InPコアを約80℃~約320℃の温度で添加することと;
(b)(a)で得られた溶液に臭化亜鉛及び塩化ガリウムを添加することと;
(c)(b)で得られた溶液にセレン源を添加することと;
(d)(c)で得られた溶液を約250℃~約320℃の温度に加熱することと;
(e)(d)で得られた溶液を放冷することと;
を含む方法に関する。
[0110] 幾つかの実施形態において、ナノ構造体は高いフォトルミネッセンス量子収率を示す。幾つかの実施形態において、ナノ構造体は、約60%~約99%、約60%~約95%、約60%~約90%、約60%~約85%、約60%~約80%、約60%~約70%、約70%~約99%、約70%~約95%、約70%~約90%、約70%~約85%、約70%~約80%、約80%~約99%、約80%~約95%、約80%~約90%、約80%~約85%、約85%~約99%、約85%~約95%、約80%~約85%、約85%~約99%、約85%~約90%、約90%~約99%、約90%~約95%、又は約95%~約99%の間のフォトルミネッセンス量子収率を示す。幾つかの実施形態において、ナノ構造体は、約85%~約90%の間のフォトルミネッセンス量子収率を示す。一実施形態において、コア-シェル型ナノ構造体は、InP/ZnSeである。
[0113] ナノ構造体を、デバイスに使用した場合にEQE及び寿命を予期せぬほど向上させる、表面処理に付す。表面処理は、不活性雰囲気下に、カルボン酸亜鉛及びハロゲン化亜鉛を含む溶液を用いて高温で処理することを含む。幾つかの実施形態において、カルボン酸亜鉛は、酢酸亜鉛である。幾つかの実施形態において、ハロゲン化亜鉛は、フッ化亜鉛である。一実施形態において、酢酸亜鉛は、二水和物の形態にある。一実施形態において、コア-シェル型ナノ構造体は、InP/ZnSeである。
[0119] 幾つかの実施形態において、コア-シェル型ナノ構造体は、ピーク発光波長(PWL)が、約400nm~約650nm、約400nm~約600nm、約400nm~約550nm、約400nm~約500nm、約400nm~約450nm、約450nm~約650nm、約450nm~約600nm、約450nm~約550nm、約450nm~約500nm、約500nm~約650nm、約500nm~約600nm、約500nm~約550nm、約550nm~約650nm、約550nm~約600nm、又は約600nm~約650nmの間にある光を放出する。幾つかの実施形態において、ナノ構造体は、約500nm~約550nmの間にPWLを有する光を放出する。幾つかの実施形態において、ナノ構造体は、約530nm~約540nmの間にPWLを有する光を放出する。一実施形態において、コア-シェル型ナノ構造体は、InP/ZnSeである。
[0120] コア-シェル型ナノ構造体の集団は、任意選択的に、フィルムを形成するマトリックス(例えば、有機ポリマー、ケイ素含有ポリマー、無機、ガラス状、及び/又は他のマトリックス)に埋め込むことができる。このフィルムは、ナノ構造を有するリン光体の製造に使用することができ、及び/又はデバイス、例えば、LED、バックライト、ダウンライト、若しくは他のディスプレイ若しくは照明ユニット若しくは光学フィルタに組み込むことができる。例示的なリン光体及び照明ユニットにおいては、例えば、所望の波長若しくはその付近に発光極大を有するナノ構造体の集団を組み込むことにより特定の色の光を生成するか、又は異なる発光極大を有する2種以上の異なるナノ構造体の集団を組み込むことにより広色域を生成することができる。様々な好適なマトリックスが当該技術分野において知られている。例えば、米国特許第7,068,898号並びに米国特許出願公開第2010/0276638号、米国特許出願公開第2007/0034833号、及び米国特許出願公開第2012/0113672号を参照されたい。例示的なナノ構造を有するリン光フィルム、LED、バックライトユニット等は、例えば、米国特許出願公開第2010/0276638号、米国特許出願公開第2012/0113672号、米国特許出願公開第2008/0237540号、米国特許出願公開第2010/0110728号、及び米国特許出願公開第2010/0155749号並びに米国特許第7,374,807号、米国特許第7,645,397号、米国特許第6,501,091号、及び米国特許第6,803,719号に記載されている。一実施形態において、コア-シェル型ナノ構造体は、InP/ZnSeである。
(a)第1導電層と;
(b)第2導電層と;
(c)第1導電層及び第2導電層の間のナノ構造体層と;
を備え、ナノ構造体層は、ナノ結晶コア及びその表面に結合している酢酸亜鉛及びフッ化亜鉛を有する少なくとも1つのシェルを備えるナノ構造体の集団を含む、ナノ構造体成形品を提供する。幾つかの実施形態において、コア-シェル型ナノ構造体は、InP/ZnSeである。
(a)少なくとも1つのナノ構造体の集団であって、ナノ構造体は、コアと、その表面に結合しているカルボン酸亜鉛及びハロゲン化亜鉛を有する少なくとも1つのシェルとを備える、ナノ構造体の集団と;
(b)少なくとも1種の有機樹脂と;
を含む、ナノ構造体フィルムを提供する。
(a)第1導電層と;
(b)第2導電層と;
(c)第1導電層及び第2導電層の間の発光層と;
を備え、発光層は、(i)ナノ結晶コアと、その表面に結合している酢酸亜鉛及びフッ化亜鉛とを備える少なくとも1つのナノ構造体の集団を含む、発光ダイオードを提供する。
(a)第1光を放出するディスプレイパネルと;
(b)第1光をディスプレイパネルに供給するように構成されたバックライトユニットと;
(c)色変換層を備える少なくとも1つの画素領域を含むカラーフィルタと;
を備える、ディスプレイデバイスを提供する。
[0152] ナノ構造体の有機溶媒中の分散液を用いる薄いフィルムの形成は、多くの場合、スピンコーティング等の塗工技法を用いて達成される。しかしながら、これらの塗工技法は、一般に、大面積の薄いフィルムの形成には適しておらず、堆積した層にパターン形成する手段を提供するものではなく、したがって、使用が限られている。インクジェット印刷では、大規模及び低コストで薄いフィルムを正確なパターンで配置することが可能である。インクジェット印刷はまた、ナノ構造体層を正確にパターン形成することも可能であり、ディスプレイの画素の印刷が可能であり、光パターニングが不要である。したがって、インクジェット印刷は、産業用途、特にディスプレイ用途に非常に魅力的である。
InP/ZnSe緑色発光ナノ構造体の作製
[0160] 以下に示すプロセスを用いてInP/ZnSe緑色発光ナノ構造体を作製した。
InP/ZnSe緑色発光ナノ構造体の表面処理
[0176] 実施例1で得られた反応混合物を室温に冷却した後、ラバーセプタムを素早く外し、酢酸亜鉛二水和物4.36グラム及びフッ化亜鉛3グラムをフラスコに加えた。ラバーセプタムを素早く戻した。
表面処理されたInP/ZnSe緑色発光ナノ構造体の特性評価
[0182] 表面処理されたコア/シェル型ナノ構造体を試験するためにQLEDデバイスを作製した。デバイスは、ITOコートされたガラス基板、PEDOT-PSS含有正孔注入層(HIL)、正孔輸送層、無水オクタン中ナノ構造体層、ETL層(ZnMgO)、及びカソード層(アルミニウム)から構成されるものとした。表1に、ナノ構造体層中に、表面処理条件1を用いたInP/ZnSe/ZnS、InP/ZnSe、InP/ZnSeを含むデバイス、及び表面処理条件2を用いたInP/ZnSeを含むデバイスの試験結果を示す。
Claims (31)
- ナノ結晶コアと、その表面に結合しているカルボン酸亜鉛及びハロゲン化亜鉛を有する少なくとも1つのシェルとを備え、
前記ナノ結晶コアはInP又はCdSeを含み、
前記少なくとも1つのシェルはZnSeである、
ナノ構造体の集団。 - 前記少なくとも1つのシェルの厚みは、0.9nm~1.1nmである、請求項1に記載のナノ構造体の集団。
- 前記ナノ構造体の直径は、3.6nm~13.2nmである、請求項1又は2に記載のナノ構造体の集団。
- InP/ZnSeコア-シェル型ナノ構造体である、請求項1~3のいずれか一項に記載のナノ構造体の集団。
- CdSe/ZnSeコア-シェル型ナノ構造体である、請求項1~3のいずれか一項に記載のナノ構造体の集団。
- 発光スペクトルの半値全幅(FWHM)は、40nm未満である、請求項1~5のいずれか一項に記載のナノ構造体の集団。
- 発光スペクトルのFWHMは、38~39nmである、請求項1~6のいずれか一項に記載のナノ構造体の集団。
- 量子収率(QY%)は、80%を超える、請求項1~7のいずれか一項に記載のナノ構造体の集団。
- QY%は、85~88%である、請求項1~8のいずれか一項に記載のナノ構造体の集団。
- 前記カルボン酸亜鉛は、酢酸亜鉛である、請求項1~9のいずれか一項に記載のナノ構造体の集団。
- 前記カルボン酸亜鉛は、酢酸亜鉛二水和物である、請求項10に記載のナノ構造体の集団。
- 前記ハロゲン化亜鉛は、フッ化亜鉛である、請求項1~11のいずれか一項に記載のナノ構造体の集団。
- 請求項1~12のいずれか一項に記載のナノ構造体の集団の製造方法であって:
(a)不活性雰囲気下において、溶媒中のコア-シェル型ナノ構造体の集団をカルボン酸亜鉛及びハロゲン化亜鉛と混合することと;
(b)(a)の混合物の温度を81℃~385℃の間の温度まで昇温することと;
(c)その表面に結合しているカルボン酸亜鉛及びハロゲン化亜鉛を有するコア-シェル型ナノ構造体の集団を単離することと;
を含む方法。 - 前記溶媒は、1-オクタデセン、1-ヘキサデセン、1-エイコセン、エイコサン、オクタデカン、ヘキサデカン、テトラデカン、スクアレン、スクアラン、トリオクチルホスフィンオキシド、トリオクチルアミン、トリオクチルホスフィン、若しくはジオクチルエーテル、又はこれらの組合せを含む、請求項13に記載の方法。
- 前記溶媒は、1-オクタデセンを含む、請求項13又は14に記載の方法。
- (a)における前記混合は、0℃~165℃の間の温度で行われる、請求項13~15のいずれか一項に記載の方法。
- 前記ナノ構造体の集団は、InP/ZnSeコア-シェル型ナノ構造体の集団である、請求項13~16のいずれか一項に記載の方法。
- 前記カルボン酸亜鉛は、酢酸亜鉛である、請求項13~17のいずれか一項に記載の方法。
- 前記酢酸亜鉛は、酢酸亜鉛二水和物の形態にある、請求項18に記載の方法。
- 前記コア-シェル型ナノ構造体の集団は、
(d)不活性雰囲気下において、溶媒、配位子、及び塩化亜鉛を含む溶液にInPコアを72℃~165℃の温度で添加することと;
(e)(d)で得られた溶液に臭化亜鉛及び塩化ガリウムを添加することと;
(f)(e)で得られた溶液にセレン源を添加することと;
(g)(f)で得られた溶液を135℃~374℃の温度に加熱することと;
(h)(g)で得られた溶液を放冷することと;
により得られる、請求項13に記載の方法。 - (d)における前記溶媒は、1-オクタデセン、1-ヘキサデセン、1-エイコセン、エイコサン、オクタデカン、ヘキサデカン、テトラデカン、スクアレン、スクアラン、トリオクチルホスフィンオキシド、トリオクチルアミン、トリオクチルホスフィン、若しくはジオクチルエーテル、又はこれらの組合せを含む、請求項20に記載の方法。
- (d)における前記溶媒は、1-オクタデセンを含む、請求項20又は21に記載の方法。
- 前記配位子は、脂肪酸である、請求項20~22のいずれか一項に記載の方法。
- 前記脂肪酸は、ラウリン酸である、請求項23に記載の方法。
- ナノ構造体フィルムであって:
(a)請求項1~12のいずれか一項に記載のナノ構造体の集団の少なくとも1つの集団と;
(b)少なくとも1種の有機樹脂と;
を含む、ナノ構造体フィルム。 - 前記ナノ構造体は、前記ナノ構造体フィルムを形成するマトリックスに埋め込まれている、請求項25に記載のナノ構造体フィルム。
- ナノ構造体成形品であって:
(a)第1導電層と;
(b)第2導電層と;
(c)前記第1導電層及び前記第2導電層の間のナノ構造体層と;
を備え、前記ナノ構造体層は、請求項1~12のいずれか一項に記載のナノ構造体の集団を含む、ナノ構造体成形品。 - 請求項1~12のいずれか一項に記載のナノ構造体の集団を含む、ディスプレイデバイス。
- 請求項1~12のいずれか一項に記載のナノ構造体の集団を含むフィルムを備える、請求項28に記載のディスプレイデバイス。
- 前記ナノ構造体の集団は、前記フィルムを形成するマトリックスに埋め込まれている、請求項29に記載のディスプレイデバイス。
- 前記フィルムは、導光板上に配置されている、請求項29又は30に記載のディスプレイデバイス。
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