JP2016536640A - 光散乱シート、これを含む電子素子およびその製造方法 - Google Patents
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Abstract
Description
2)前記高分子が溶媒に溶解する温度に前記混合液を昇温する段階、
3)前記混合液に量子ドットを添加した後、前記混合液を冷却することによって前記高分子が再結晶した粒子を生成する段階、および
4)前記3)段階で形成された粒子を含む組成物を利用して光散乱シートを製造する段階を含む、光散乱シートの製造方法を提供する。
高分子の結晶部に分散した量子ドットを含む粒子の製造
20mlのバイアル瓶にポリエチレンワックス50mgを小分けして5gのトルエンを添加した後、溶液を90℃まで加熱した。前記溶液が90℃に達した直後に、適正濃度(standard:25mg/ml toluene)CdSe/ZnSの赤色光量子ドット溶液を120μl注入した。予め温度を設定しておいた常温の水浴(water bath)にバイアル瓶を入れて1分間撹拌(200rpm)した後、バイアル瓶を水浴から取り出して空気中に4分間放置し、バイアル瓶からストリングバーを抜き取った。完全に冷えるまで放置した後、バイアル瓶の溶液の20gを集めてコニカルチューブ(conical tube)に分注し、洗滌のために遠心分離(3000rpm、5min)した。遠心分離後に上澄み液は捨て、沈殿しているマイクロカプセルにトルエンを添加して20gの溶液を生成してボルテックス(vortexing)で再分散した。このような洗滌過程を3回繰り返し、未反応物質は完全に除去した。
再結晶温度である水浴の温度を25℃に変更したことを除いては、製造例1と等しい。
再結晶温度である水浴の温度を40℃に変更したことを除いては、製造例1と等しい。
再結晶温度である水浴の温度を50℃に変更したことを除いては、製造例1と等しい。
再結晶温度である水浴の温度を60℃に変更したことを除いては、製造例1と等しい。
120μlの赤色光量子ドット溶液の代わりに適正濃度(standard:25mg/ml toluene)CdSe/ZnSの緑色光量子ドット溶液120μlを注入したことを除いては、製造例4と等しい。
120μlの赤色光量子ドット溶液の代わりに240μlの赤色光量子ドット溶液(CdSe/ZnS 25mg/ml toluene)を注入したことを除いては、製造例4と等しい。
120μlの赤色光量子ドット溶液の代わりに240μlの緑色光量子ドット溶液(CdSe/ZnS 25mg/ml toluene)を注入したことを除いては、製造例4と等しい。
120μlの赤色光量子ドット溶液の代わりに360μlの赤色光量子ドット溶液(CdSe/ZnS 25mg/ml toluene)を注入したことを除いては、製造例4と等しい。
120μlの赤色光量子ドット溶液の代わりに360μlの緑色光量子ドット溶液(CdSe/ZnS 25mg/ml toluene)を注入したことを除いては、製造例4と等しい。
光散乱シートの製造
光変換層の形成時、トリメチロールプロパントリアクリレート(trimethylolpropane triacrylate、TMPTA)1.8gを光硬化樹脂として利用した。光開始剤はIRG184 0.018gおよびD−1173 0.018gを利用した。このとき、量子ドットを含む粒子は、製造例4で製造された粒子0.318gを使用した。前記光硬化樹脂、光開始剤、および量子ドットを含む粒子を混合して組成物を製造した後、前記粒子の分散性を高めるために35分間に渡ってソニケーション(sonication)を行った。その後、前記組成物をポリエチレンテレフタレート(PET)フィルムに塗布した後にバー(bar)コーティングし、光変換層が形成された光散乱シートを製造した。光変換層に存在する溶媒が完全に蒸発するように60℃のオーブンに2分間入れた後、UV硬化器(1000mJ/cm2)によって光変換層を硬化させた。
光硬化樹脂として、TMPTAの代わりに6−[[1−oxo−6−[(1−oxo−2−propen−1−yl)oxy]hexyl]oxy]−、1、1’−[oxybis[2、2−bis[[[1−oxo−6−[[1−oxo−6−[(1−oxo−2−propen−1−yl)oxy]hexyl]oxy]hexyl]oxy]methyl]−3、1−propanediyl]]ester(DPCA−120)1.8gを使用したことを除いては、実施例1と等しい。
光硬化樹脂として、TMPTAの代わりに9−ethylene glycol diacrylate(9−EGDA)1.8gを使用したことを除いては、実施例1と等しい。
光変換層の形成時、トリメチロールプロパントリアクリレート(trimethylolpropane triacrylate、TMPTA)1.8gを光硬化樹脂として利用し、光開始剤はIRG184 0.018gおよびD−1173 0.018gを利用した。
高分子の結晶部に分散した量子ドットを含む粒子の走査型電子顕微鏡(SEM)の測定
製造例1〜5で製造された粒子の再結晶形態を見るために、走査型電子顕微鏡(SEM)を測定した。その結果は図7に示し、左側上端の温度は粒子の製造時の再結晶温度を表示した。
高分子の結晶部に分散した量子ドットを含む粒子の透過型電子顕微鏡(TEM)の測定
製造例1のポリエチレン内に分散している量子ドットを観察するために透過型電子顕微鏡を測定し、これを図8に示した。これにより、量子ドットがポリエチレン内で凝集せず、全体的に適切に分散していることが分かる。
蛍光顕微鏡の観察
実施例1と比較例1で製造された光散乱シートを、蛍光顕微鏡によって粒子の分布および凝集状態を観察し、その結果を図5に示した。
光散乱シートの発光強度
実施例1と比較例1で製造された光散乱シートの発光強度を測定したグラフを図6に示した。
601 ・・・輝度向上フィルム
602 ・・・光散乱シート
604 ・・・光散乱シート
606 ・・・導光板
608 ・・・反射板
610 ・・・光源
620 ・・・上部バリアフィルム
622 ・・・下部バリアフィルム
Claims (14)
- 光変換層を含む光散乱シートであって、
前記光変換層は、結晶部を含む高分子、および前記高分子の結晶部に分散した量子ドットを含む粒子を含み、
最長の長さの方向をX軸、前記X軸の面方向に垂直である方向をY軸、厚さ方向に前記X軸およびY軸に垂直である方向をZ軸と定義するとき、前記粒子の大きさは、X軸に0.1μm以上50μm以下であり、Y軸に0.1μm以上50μm以下であり、Z軸に0.1μm以上50μm以下である、光散乱シート。 - 前記粒子は、入射した光の波長を変換して波長変換光を発生させながら光を散乱させる、請求項1に記載の光散乱シート。
- 前記光変換層の光効率は、量子効率が0.05以上0.95以下である、請求項1に記載の光散乱シート。
- 前記光変換層の厚さは0.1μm以上500μm以下である、請求項1に記載の光散乱シート。
- 前記量子ドットは前記結晶部の高分子鎖の間に分散する、請求項1に記載の光散乱シート。
- 前記量子ドットの大きさは1nm以上10nm以下である、請求項1に記載の光散乱シート。
- 前記高分子の結晶化度は50%以上である、請求項1に記載の光散乱シート。
- 前記光変換層は2以上の光変換層を含み、
前記2以上の光変換層はそれぞれ、入射した光の波長を互いに異なる波長に変換させることができる、請求項1に記載の光散乱シート。 - 前記光変換層は、入射した光の波長を変換して白色光を発生させる、請求項1に記載の光散乱シート。
- 前記光変換層は2層の光変換層を含み、
前記光変換層は、青色光の波長を変換して赤色光を発生させる第1光変換シート、および青色光の波長を変換して緑色光を発生させる第2光変換シートを含む、請求項1に記載の光散乱シート。 - 前記光変換シートの両面のうち少なくとも一面に備えられたバリアフィルムをさらに含む、請求項1に記載の光散乱シート。
- 請求項1〜11のいずれか一項に記載の光散乱シートを含む、電子素子。
- 請求項12に記載の電子素子を含む、照明装置。
- 請求項12に記載の電子素子を含む、ディスプレイ装置。
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