JP2007053090A - 白色有機発光素子及びその製造方法 - Google Patents
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- RBTKNAXYKSUFRK-UHFFFAOYSA-N heliogen blue Chemical group [Cu].[N-]1C2=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=NC([N-]1)=C(C=CC=C3)C3=C1N=C([N-]1)C3=CC=CC=C3C1=N2 RBTKNAXYKSUFRK-UHFFFAOYSA-N 0.000 description 1
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- CECAIMUJVYQLKA-UHFFFAOYSA-N iridium 1-phenylisoquinoline Chemical compound [Ir].C1=CC=CC=C1C1=NC=CC2=CC=CC=C12.C1=CC=CC=C1C1=NC=CC2=CC=CC=C12.C1=CC=CC=C1C1=NC=CC2=CC=CC=C12 CECAIMUJVYQLKA-UHFFFAOYSA-N 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Inorganic materials [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000003960 organic solvent Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
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Abstract
【解決手段】第1電極と,上記第1電極上端に形成された正孔輸送部と,上記正孔輸送部上端に形成された青色発光層と,上記青色発光層上端に形成された緑色発光層と,上記緑色発光層上端に形成された赤色発光層と,上記赤色発光層上端に形成された第2電極と,を含み,上記第1電極及び第2電極の間に介在されたそれぞれの発光層から発散された光が共振効果によって白色を表示してXが0.27〜0.39,Yが0.27〜0.39の色座標であるように正孔輸送部,青色発光層及び緑色発光層が所定の厚さを備える。
【選択図】図1
Description
用意した有機基板上にITOを電気蒸着してアノードを10nmで形成した後,さらにAgを利用して反射膜を100nmの厚さで形成した。
青色発光層の厚さ,緑色発光層及び赤色発光層の厚さをそれぞれ25nm,20nm及び40nmで形成したことを除いて実施例1と同様に有機発光素子を製造した。
用意した有機基板上にITOを電気蒸着してアノードを10nmで形成した後,さらにAgを利用して反射膜を100nmの厚さで形成した。
正孔注入層の厚さ及び正孔輸送層の厚さをそれぞれ130nm及び20nmで形成したことを除いて実施例3と同様に有機発光素子を製造した。
正孔輸送層の厚さを10nmで形成し,青色発光層の厚さ,緑色発光層の厚さ及び赤色発光層の厚さをそれぞれ15nm,10nm,40nmで形成したことを除いて実施例1と同様に有機発光素子を製造した。
正孔輸送層の厚さを50nmで形成し,青色発光層の厚さ,緑色発光層の厚さ及び赤色発光層の厚さをそれぞれ15nm,10nm及び40nmで形成したことを除いて実施例1と同様に有機発光素子を製造した。
正孔注入層の厚さ及び正孔輸送層の厚さをそれぞれ80nm及び20nmで形成し,青色発光層の厚さ,緑色発光層の厚さ及び赤色発光層の厚さをそれぞれ30nm,20nm及び40nmで形成したことを除いて実施例3と同様に有機発光素子を製造した。
正孔注入層の厚さ及び正孔輸送層の厚さをそれぞれ180nm及び20nmで形成し,青色発光層の厚さ,緑色発光層及び赤色発光層の厚さをそれぞれ30nm,20nm及び40nmで形成したことを除いて実施例3と同様に有機発光素子を製造した。
上記実施例1〜6及び比較例1〜4によって製造された白色有機発光素子の駆動電圧,効率(電流密度)及び色座標を下記の方法によって調査し,その結果を下記表1に示した。
輝度 : BM5A(Topcon社)で測定する。
駆動電圧 : Keithleyの238HIGH CURRENT SOURCE MEASURE UNITで測定する。
電流密度: 直流(DC)10〜100mA/cm2まで10mA/cm2ずつ向上させながら進行し,同じ素子構造から9個以上のポイントで評価した。
色座標 : PR650スペトロメータで色座標を確認した。
20 第1電極
30a 正孔注入層
30b 正孔輸送層
40a 青色発光層
40b 緑色発光層
40c 赤色発光層
50 電子輸送層
60 電子注入層
70 第2電極
Claims (14)
- 第1電極と;
前記第1電極上に形成された正孔輸送部と;
前記正孔輸送部上に形成された青色発光層と;
前記青色発光層上に形成された緑色発光層と;
前記緑色発光層上に形成された赤色発光層と;
前記赤色発光層上に形成された第2電極と;を備え,
前記第1電極及び前記第2電極の間に介在されたそれぞれの発光層から発散された光が,Xが0.27〜0.39,Yが0.27〜0.39の色座標を有する白色光になるように前記正孔輸送部,前記青色発光層及び前記緑色発光層が所定の厚さを備えることを特徴とする白色有機発光素子。 - 前記正孔輸送部の厚さが,15〜40nmであり,
前記正孔輸送部と前記青色発光層の総厚さが,30〜50nmであり,
前記正孔輸送部,前記青色発光層及び前記緑色発光層の総厚さが,40〜60nmであることを特徴とする,請求項1に記載の白色有機発光素子。 - 前記正孔輸送部の厚さが,120〜160nmであり,
前記正孔輸送部と前記青色発光層の総厚さが,160〜200nmであり,
前記正孔輸送部,前記青色発光層及び前記緑色発光層の総厚さが,200〜240nmであることを特徴とする,請求項1に記載の白色有機発光素子。 - 前記第1電極は,アノードであり,前記第2電極はカソードであることを特徴とする,請求項1〜3のいずれかに記載の白色有機発光素子。
- 前記アノードは,反射電極であることを特徴とする,請求項4に記載の白色有機発光素子。
- 前記正孔輸送部は,正孔注入層,正孔輸送層のいずれか一方または双方であることを特徴とする,請求項1〜5のいずれかに記載の白色有機発光素子。
- 前記赤色発光層と前記第2電極の間には,正孔抑制層,電子注入層及び電子輸送層からなる群より選択される1種以上の層がさらに含まれることを特徴とする,請求項1〜6のいずれかに記載の有機発光素子。
- 前記赤色発光層の厚さは,15〜40nmであることを特徴とする,請求項2に記載の白色有機発光素子。
- 前記赤色発光層の厚さは,20〜50nmであることを特徴とする,請求項3に記載の白色有機発光素子。
- 基板上部に第1電極を形成する段階と;
前記第1電極上部に正孔輸送部を形成する段階と;
前記正孔輸送部上部に青色発光層を形成する段階と;
前記青色発光層上部に緑色発光層を形成する段階と;
前記緑色発光層上部に赤色発光層を形成する段階と;
前記赤色発光層上部に第2電極を形成する段階と;を備え,
前記第1電極及び前記第2電極の間に介在されたそれぞれの発光層から発散された光が,Xが0.27〜0.39,Yが0.27〜0.39の色座標を有する白色光になるように前記正孔輸送部,前記青色発光層及び前記緑色発光層が所定の厚さに形成されることを特徴とする白色有機発光素子の製造方法。 - 前記正孔輸送部の厚さは15〜40nmで形成され,
前記正孔輸送部及び前記青色発光層の総厚さは30〜50nmで形成され,
前記正孔輸送部,前記青色発光層及び前記緑色発光層の総厚さは40〜60nmで形成されることを特徴とする,請求項10に記載の白色有機発光素子の製造方法。 - 前記正孔輸送部の厚さは120〜160nmで形成され,
前記正孔輸送部及び前記青色発光層の総厚さは160〜200nmで形成され,
前記正孔輸送部,前記青色発光層及び前記緑色発光層の総厚さは200〜240nmで形成されることを特徴とする,請求項10に記載の白色有機発光素子の製造方法。 - 前記第1電極上部に反射膜を形成する段階をさらに含むことを特徴とする,請求項10〜12のいずれかに記載の白色有機発光素子の製造方法。
- 前記正孔輸送部は,正孔注入層,正孔輸送層のいずれか一方または双方であることを特徴とする,請求項10〜13のいずれかに記載の白色有機発光素子の製造方法。
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