JP6564176B2 - 発光素子、発光装置、電子機器、および照明装置 - Google Patents
発光素子、発光装置、電子機器、および照明装置 Download PDFInfo
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- JP6564176B2 JP6564176B2 JP2014211524A JP2014211524A JP6564176B2 JP 6564176 B2 JP6564176 B2 JP 6564176B2 JP 2014211524 A JP2014211524 A JP 2014211524A JP 2014211524 A JP2014211524 A JP 2014211524A JP 6564176 B2 JP6564176 B2 JP 6564176B2
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/32—Stacked devices having two or more layers, each emitting at different wavelengths
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Description
本実施の形態では、本発明の一態様である発光素子について説明する。
本実施の形態では、本発明の一態様として、電荷発生層を挟んでEL層を複数有する構造の発光素子(以下、タンデム型発光素子という)について図2を用いて説明する。
本実施の形態では、本発明の一態様である発光装置について説明する。
本実施の形態では、本発明の一態様である発光素子を有する発光装置について説明する。
本実施の形態では、本発明の一態様である発光素子を適用して作製された発光装置を用いて完成させた様々な電子機器の一例について、図5を用いて説明する。
本実施の形態では、本発明の一態様である発光素子を含む発光装置を適用した照明装置の一例について、図6を用いて説明する。
まず、ガラス製の基板700上に酸化珪素を含むインジウム錫酸化物(ITSO)をスパッタリング法により成膜し、陽極として機能する第1の電極701を形成した。なお、その膜厚は110nmとし、電極面積は2mm×2mmとした。
作製した発光素子1および比較発光素子2の動作特性について測定した。なお、測定は室温(25℃に保たれた雰囲気)で行った。
本実施例で示す発光素子は、図14において、図14(A)の左側に発光素子3、右側に比較発光素子4を示しており、発光素子3および比較発光素子4は、いずれも緑色発光を呈する発光素子である。また、図14(B)の左側に発光素子5、右側に比較発光素子6を示しており、発光素子5および比較発光素子6は、いずれも赤色発光を呈する発光素子である。なお、これらの発光素子は、全て、第2の電極4003側から光が出る構造を有している。
作製した各発光素子の動作特性について測定した。なお、測定は室温(25℃に保たれた雰囲気)で行った。なお、下記に示す図15における凡例中の素子番号には、各発光素子の発光色がわかるように緑色発光の発光素子の場合には(G)、赤色発光の発光素子の場合には(R)と付記した。さらに、図17中の記載についても同様である。
発光素子3の発光層(B)付近〜第2の電子輸送層付近について、ToF−SIMSにより分析した結果を図20(A)(B)に示す。また、発光素子5については、図21(A)(B)に示す。各図において、縦軸は規格化した二次イオン強度、横軸は深さをそれぞれ示し、0サイクルを掘削しはじめとして表す。従って、ここでの0サイクルは、陰極側の第2の電子注入層付近を示す。なお、同一素子の(A)と(B)の横軸のスケールは同じである。これらの図のうち、図20(A)および図21(A)はm/z=615、m/z=714、m/z=976、m/z=1074の二次イオン強度を示した。また図20(B)および図21(B)はm/z=565、m/z=678の二次イオン強度を示した。
次に、発光素子3の発光層(B)4013bの第3の発光層(4013(b3))付近、第2の発光層(4013(b2))付近、および第1の発光層(4013(b1))付近についてそれぞれ測定し、発光素子3の発光層(B)4013bの第3の発光層(4013(b3))付近の測定結果を図22(A)、第2の発光層(4013(b2))付近の測定結果を図22(B)、第1の発光層(4013(b1))付近の測定結果を図22(C)にそれぞれ示す。なお、図22(A)は図20の37〜38サイクル、図22(B)は図20の46〜47サイクル、図22(C)は図20の58〜59サイクル部分の積算検出強度に対応する。また、図22(A)(B)(C)は、いずれも縦軸に二次イオン強度、横軸に質量電荷比を示す。
次に、発光素子3の発光層(B)4013bの第1の発光層(4013(b1))および第3の発光層(4013(b3))に含まれる[Ir(tBuppm)2(acac)]の単膜を蒸着法により作製し、ToF−SIMSによる測定を行った。図24に測定結果を示す。また、図24において、縦軸は二次イオン強度、横軸は質量電荷比を示す。
102 陰極
103 EL層
104 正孔注入層
105 正孔輸送層
106 発光層
106a 第1の発光層
106b 第2の発光層
106c 第3の発光層
107 電子輸送層
108 電子注入層
109a 第1の発光性材料、109b 第2の発光性材料
110 電子輸送性材料
111 正孔輸送性材料
201 第1の電極
202(1) 第1のEL層
202(2) 第2のEL層
202(n) 第(n)のEL層
204 第2の電極
205 電荷発生層
205(1) 第1の電荷発生層
205(2) 第2の電荷発生層
205(n−1) 第(n−1)の電荷発生層
301 反射電極
302 半透過・半反射電極
303 透明導電層
304G 第1の発光層(G)
304R 第2の発光層(R)
305 EL層
310R 第1の発光素子(R)
310G 第2の発光素子(G)
401 素子基板
402 画素部
403 駆動回路部(ソース線駆動回路)
404a、404b 駆動回路部(ゲート線駆動回路)
405 シール材
406 封止基板
407 配線
408 FPC(フレキシブルプリントサーキット)
409 FET
410 FET
411 スイッチング用FET
412 電流制御用FET
413 第1の電極(陽極)
414 絶縁物
415 EL層
416 第2の電極(陰極)
417 発光素子
418 空間
700 基板
701 第1の電極
702 第2の電極
703 EL層
704 正孔注入層
705 正孔輸送層
706 発光層
707 電子輸送層
708 電子注入層
7100 テレビジョン装置
7101 筐体
7103 表示部
7105 スタンド
7107 表示部
7109 操作キー
7110 リモコン操作機
7201 本体
7202 筐体
7203 表示部
7204 キーボード
7205 外部接続ポート
7206 ポインティングデバイス
7302 筐体
7304 表示パネル
7305 時刻を表すアイコン
7306 その他のアイコン
7311 操作ボタン
7312 操作ボタン
7313 接続端子
7321 バンド
7322 留め金
7400 携帯電話機
7401 筐体
7402 表示部
7403 操作用ボタン
7404 外部接続部
7405 スピーカ
7406 マイク
7407 カメラ
8001 照明装置
8002 照明装置
8003 照明装置
8004 照明装置
Claims (8)
- 一対の電極間に少なくとも発光層を有し、
前記発光層は、第1の発光層と、第2の発光層と、第3の発光層とが順に積層された積層構造を有し、
前記第1の発光層は、第1の発光性材料と、第1の正孔輸送性材料と、第1の電子輸送性材料と、を有し、
前記第2の発光層は、第2の発光性材料と、第2の正孔輸送性材料と、第2の電子輸送性材料と、を有し、
前記第3の発光層は、第3の発光性材料と、第3の正孔輸送性材料と、第3の電子輸送性材料と、を有し、
前記第1の正孔輸送性材料と、前記第2の正孔輸送性材料と、前記第3の正孔輸送性材料とは、同一の材料であり、
前記第1の電子輸送性材料と、前記第2の電子輸送性材料と、前記第3の電子輸送性材料とは、同一の材料であり、
前記第1の正孔輸送性材料と、前記第1の電子輸送性材料とは、励起錯体を形成する組み合わせであり、
前記第1の発光性材料と前記第3の発光性材料とは、同一の材料であり、かつ、前記第1の発光層および前記第3の発光層から得られる発光は、前記第2の発光層から得られる発光よりも短波長であり、
前記第1の発光層から前記第1の発光性材料に由来する発光が得られ、
前記第2の発光層から前記第2の発光性材料に由来する発光が得られる発光素子。 - 一対の電極間に少なくとも発光層を有し、
前記発光層は、第1の発光層と、第2の発光層と、第3の発光層とが順に積層された積層構造を有し、
前記第1の発光層は、第1の発光性材料と、第1の正孔輸送性材料と、第1の電子輸送性材料と、を有し、
前記第2の発光層は、第2の発光性材料と、第2の正孔輸送性材料と、第2の電子輸送性材料と、を有し、
前記第3の発光層は、第3の発光性材料と、第3の正孔輸送性材料と、第3の電子輸送性材料と、を有し、
前記第1の正孔輸送性材料と、前記第2の正孔輸送性材料と、前記第3の正孔輸送性材料とは、同一の材料であり、
前記第1の電子輸送性材料と、前記第2の電子輸送性材料と、前記第3の電子輸送性材料とは、同一の材料であり、
前記第1の正孔輸送性材料と、前記第1の電子輸送性材料とは、励起錯体を形成する組み合わせであり、
前記第1の発光性材料と前記第3の発光性材料とは、同一の材料であり、かつ前記第2の発光性材料よりも発光ピークが短波長である材料であり、
前記第1の発光層から前記第1の発光性材料に由来する発光が得られ、
前記第2の発光層から前記第2の発光性材料に由来する発光が得られる発光素子。 - 請求項1または請求項2において、
前記第1の電子輸送性材料は、π電子不足型複素芳香族化合物である発光素子。 - 請求項1乃至請求項3のいずれか一において、
前記第1の正孔輸送性材料は、π電子過剰型複素芳香族化合物または芳香族アミン化合物である発光素子。 - 請求項1乃至請求項4のいずれか一に記載の発光素子を用いた発光装置。
- 請求項1乃至請求項4のいずれか一に記載の発光素子を複数有し、
前記一対の電極の一方は、反射電極と透明導電層が積層された構造を有し、かつ、前記反射電極と前記発光層との間に、前記透明導電層が位置し、
前記一対の電極の他方は、半透過・半反射電極であり、
前記透明導電層が異なる第1の発光素子と、第2の発光素子とを有する発光装置。 - 請求項5または請求項6に記載の発光装置を用いた電子機器。
- 請求項5または請求項6に記載の発光装置を用いた照明装置。
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TWI729686B (zh) | 2021-06-01 |
US20170263878A1 (en) | 2017-09-14 |
JP2015232993A (ja) | 2015-12-24 |
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TWI654775B (zh) | 2019-03-21 |
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