JP5574421B2 - 有機エレクトロルミネッセンス照明装置の製造方法 - Google Patents
有機エレクトロルミネッセンス照明装置の製造方法 Download PDFInfo
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- JP5574421B2 JP5574421B2 JP2010187152A JP2010187152A JP5574421B2 JP 5574421 B2 JP5574421 B2 JP 5574421B2 JP 2010187152 A JP2010187152 A JP 2010187152A JP 2010187152 A JP2010187152 A JP 2010187152A JP 5574421 B2 JP5574421 B2 JP 5574421B2
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/861—Repairing
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- Electroluminescent Light Sources (AREA)
Description
本発明の有機EL照明装置の製造方法の一例を、具体的に説明する。
混合気体に替えて窒素を用いた他は、実施例1と同様に有機EL照明装置を調製し、有機EL素子の整流特性、有機EL照明装置の駆動検査を行った。有機EL素子の整流特性の結果を図7に示す。図7に示すように、得られた有機EL素子は整流特性に乱れがあり、リーク、バンプが見られ、短絡しやすいことを示した。得られた有機EL照明装置は、定電流供給開始後、数分後に短絡が生じ、消光した。
水蒸気を含有しない混合気体を用いた他は、実施例1と同様に有機EL照明装置を調製し、有機EL素子の整流特性、有機EL照明装置の駆動検査を行った。有機EL素子の整流特性の結果を図8に示す。図8に示すように、得られた有機EL素子は、整流比としては10E5〜10E6程度が得られたが、逆バイアスを印加したとき整流特性に乱れがあり、リークが見られ、短絡が生じることを示した。短絡の発生が抑制された製品の歩留まりは60〜70%であった。
短絡修復工程において、透光性電極層と電極層間に印加した0〜5Vのスイープ順バイアス電圧に変えて、3V〜−10Vのスイープを10分印加した他は、実施例1と同様に有機EL照明装置を調製した。その後、逆バイアスを印加して短絡が発生したときの電圧を測定した。複数の有機EL素子について同様に行い、その平均値を、3V〜−10Vのスイープを行わなかった有機EL素子の短絡発生電圧の平均値との比較において、図6に示す。
混合気体に替えて窒素を用いた他は、実施例2と同様に有機EL照明装置を調製し、逆バイアスを印加して短絡が発生したときの電圧を測定した。複数の有機EL素子について同様に行い、その平均値を、3V〜−10Vのスイープを行わなかった有機EL素子の短絡発生電圧の平均値との比較において、図9に示す。
水蒸気を含有しない混合気体を用いた他は、実施例2と同様に有機EL照明装置を調製し、逆バイアスを印加して短絡が発生したときの電圧を測定した。複数の有機EL素子について同様に行い、その平均値を、3V〜−10Vのスイープを行わなかった有機EL素子との比較において、図10に示す。
短絡修復工程を行った後、70℃で30分と、2時間の加熱保持工程をそれぞれ行った他は、実施例1と同様に有機EL照明装置を調製し、有機EL素子を取り出し有機層のシュリンク率を測定した。結果を図5に示す。短絡修復工程後、加熱保持工程を行うことにより、短絡の発生とシュリンクやダークスポットの成長・進行を顕著に抑制することができることが分かる。
2 透光性電極層
3、31、32 有機層
4 電極層
5 有機EL素子
6 接着部材(封止部材)
9 封止基板(封止部材)
10 気密空間
Claims (4)
- 透光性基板上に設けられる透光性電極層を含む1対の電極層と、該1対の電極層に挟持され、有機エレクトロルミネッセンス物質を含有する有機層とを有する有機エレクトロルミネッセンス素子を配置する空間を封止部材によって気密に封止し、前記空間に、不活性ガスと、該不活性ガスに対し0.05〜5体積%以下の酸素及び0.05〜1.5体積%以下の水蒸気とを含む混合気体を封入して、有機エレクトロルミネッセンス物質のガラス転移温度以下の温度で、1対の電極層間に順バイアス電圧又は逆バイアス電圧を印加し、順バイアス電圧の場合DC0V〜5V間、逆バイアス電圧の場合DC0V〜−15V間でスイープさせて有機エレクトロルミネッセンス素子の短絡修復工程を行い、前記空間に、ゲッター材又はデシカント材を封入することを特徴とする有機エレクトロルミネッセンス照明装置の製造方法。
- 透光性基板上に設けられる透光性電極層を含む1対の電極層と、該1対の電極層に挟持され、有機エレクトロルミネッセンス物質を含有する有機層とを有する有機エレクトロルミネッセンス素子を、不活性ガスと、該不活性ガスに対し0.05〜5体積%以下の酸素及び0.05〜1.5体積%以下の水蒸気とを含む混合気体中に配置し、有機エレクトロルミネッセンス物質のガラス転移温度以下の温度で、1対の電極層間に順バイアス電圧又は逆バイアス電圧を印加し、順バイアス電圧の場合DC0V〜5V間、逆バイアス電圧の場合DC0V〜−15V間でスイープさせて有機エレクトロルミネッセンス素子の短絡修復工程を行い、有機エレクトロルミネッセンス素子と、ゲッター材又はデシカント材を封止部材によって気密に封止することを特徴とする有機エレクトロルミネッセンス照明装置の製造方法。
- 前記混合気体中で、前記有機エレクトロルミネッセンス素子を配置する空間を封止部材によって気密に封止することを特徴とする請求項2に記載の有機エレクトロルミネッセンス照明装置の製造方法。
- 短絡修復工程後、前記有機エレクトロルミネッセンス物質のガラス転移温度以下の温度に加熱する加熱保持工程を有することを特徴とする請求項1から3のいずれか記載の有機エレクトロルミネッセンス照明装置の製造方法。
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