OLED, ÷, TFT, TFT,
ǰ ǰ ְų, ǥ ڸ Ʈ(TFT) ũ Ǹ , ȭ , з˴ϴ. Ǹ TFT Ǹ TFT ٰ Ǹ TFT еǸ, ٰ 쿡 ° ȭ. ϳ ڸ Ʈ(organic TFT), ٿ TFTԴϴ. ȭ Ͽ Ư ϴ ߵǸ鼭 Ư ݵü Ͽϴ. , ۰ Ͽ ġ Ǿ. 뷮, ӵ ũ µ, ϴٴ , ο ռ پ ϴٴ , پٴ , , ִ ĺμ ڸű Ⱑ Ǿϴ. ̿ Բ ν پ Ư .
ݵü 帧 ϴ ڿ p n . , տ ܱؼ(unipolar) Ȥ ؼ(ambipolar) ݵüε з˴ϴ. p ݵü Ϸ ̿Ͽ ҽ ؿ Ե HOMO ˵ ̵Ŵν 帣 մϴ. Ϲ ݵü HOMO -4.5 -5.5 eV ݼ Լ Ͽ ݼ κ ϰ ̵ Ͽ, p ݵü Ȱ Ǿ Խϴ. ǥ p ݵüδ Ÿ(pentacene), ø̿(oligothiophene) ǻ ȭչ(fused aromatic compounds) ̳ ڸ̳ ܰ , Ȱ ̿Ͽϴ.
ʱ Ÿ(pentacene) ڰ ̵ 1 cm2/Vs ̻ Ư Ȱ Ǿµ, ̴ ʿ ϹǷ ٴ Ѱ谡 ־ϴ. Ÿ ڿ ؼ , Ÿ ü · մϴ. Ÿ ü ¿ · ϸ, ó Ͽ ؼ ŵǸ鼭 . ݼ ϸ 1 cm2/Vs ̻ ̵ ֽϴ. ݵü , ڿ Ư¡ ϰ . ǥ ݵü, poly(3-hexylthiophene)(P3HT) Ư , ƮͻӸ ƴ϶ ¾, پ о߿ Ȱǰ ֽϴ. n ݵü , , ȭǸ鼭 ϵǴ ־ p Ȱȭ Ͽϴ. ٰ ¾ , CMOS ȸ p-n ʿ伺 Ŀ鼭 n ݵü Ͽ ɰ ̰ ϴ Ȱ Ǿϴ. Ư, ް(elecron acceptor) ְ(electron donor) ɱ⸦ Ͽ ǰ ֽϴ. ̿ Բ n ݵü ڵ LUMO ˵ 帣Ƿ LUMO ȭ ߿մϴ. ݵü TFT 1964, CuPc(Copper(II) phthalo-cyanine) Ͽ ó Ͽ ļ ϴٰ, 1992 Ÿ 0.002 cm2/Vs ̵ 鼭 ۵Ǿϴ.
2003 3M Ÿ ̿Ͽ ̵ 5 cm2/Vs ϸ鼭 Ǹ TFT Ѿ Ǿ, پ Ͽ ֱٿ ̵ 10 cm2/Vs ½ Ѵ TFT ټ ǰ ֽϴ.
Ϲ TFT ä , ñδ Ʈ ݼ κп Ḧ ϴ ϰ. ߽ Ǿ ־ 尸 ȿ ǰ, ϵ ̷ ٱ(hopping) ̵ϹǷ ̵ ̱Ⱑ ʽϴ. ȭ̶ ֵ ̷ Ƿ ϱ .
ư ̵ ̴ ߿ѵ, ̵ ϽŰ (scattering) εδ , ̿ȭ Ҽ , ĥ , 迡 ̳ Ͽ ֽϴ. Բ ̳ õ ̵ ߿. TFT ɿ ̵ Բ ٸ TFT ̵, , (sub-threshold voltage slope, Ȥ sub-threshold swing, SS), (on-off ratio) µ Դϴ.
÷̿ TFT
̷ TFT ӵ ⺻ Ʈ, TFT ɰϱ⺸ٴ Ư Ǵ о߿ մϴ. Ư, ־ ϰų , ı ջ Ǿ ̸ غϱ Ǿ , ̵ ٴ ū ڵĸ Ǿ. µ , ڿ ִٴ ⺻ Ư¡ Ͽ ӵ , ÷̿ TFTμ ġ ˴ϴ. ̿ܿ ÷ ÷ο پ ڵ ǰ ִµ, ָ ϳ 2 Դϴ. 2 β , ִٴ Ư¡ ־ TFT ɼ ̰ ֽϴ. оԴϴ.
2
2
OLED, з
Ͼ 忡 OLED з մϴ. ߱ 翡 з, (fluorescence) α(phosphorescence) . , , ũԴ ֿ մϴ. ȿ鿡 α ȣǴ ռ ֽϴ. 翡 з, (small molecule) (polymer)ε մϴ.
̴ ڷ ̳, Ŀ ̰ Ȯ 巯. OLED , OLED մϴ. ݲ OLED ַ Ͽ , OLED Ʈ غ Դϴ.
, Ŀ з, (passive matrix driving) ɵ (active matrix driving) еǸ, ()ȭҰ TFT Ŀн ϰ ִ° Դϴ. ػ ö ȭ ũⰡ Ҽ ɵ 뼼. з, ÷ ϴ ߱(bottom emission), ո ߱(top emission), ִ (transparent) е˴ϴ. TFT ս ̷ ߱ . ߱ , µ ϴ ġ ʽϴ. ܿ ġ ⺻ ݴ, ְ ο ִ (inverted) , ū ȿ ĸ . ַ ߱ OLED ٷ ŭ ߱ OLED Ʈ Ϸ մϴ. ߱ 翡 ̾߱ ռ ٷ, ɵ ̾߱, ڿ ̾߱, ĸ ߱ ̾߱⸦ Ǯϴ.
OLED з
OLED, з, ڿ
OLED ÷Դϴ. (small molecule) (polymer) з . ڷδ 10 ϴ , ̻ ڷ ϱ .
Ư ڴ Ǵ , ܷü(monomer) Ȥ ̻ ̸ ǹմϴ. ƿ ܷü (polymerization) Ǿ ƿ . ܷü ̸, Ʈ̸, ø зϱ մϴ.
OLED Ͽ OLED OLED ˴ϴ. OLED 뷫 1980 ߹ݿ ̱, ̽Ʈ ڴ Ͽ, پ ġ鼭 OLED ַ Ǿ. ڸ OLED 1980 Ĺݿ ķ긮뿡 ۵Ǿµ, , ȿ, ɰ ʹ ־ ϼ ̸, ̾ Ƿ ǰ 밡 ǰ ֽϴ.
Ϲ OLED ذ ȭǾ , ⸷ ҿ ̿ ϴ ȭ մϴ. ϸ ٽ Դϴ. ̿ Ͽ OLED ϳ ⸷ ð ִ ҵ ν ȭ . ŷڼ Ȯ մϴ. ݱ ߵǾ ǥ ߱ ַ ڿ شϴ װ ڿ شǴµ, Ϸʷ polyarylenevinylene(PAV), polyfluorene(PF), poly-p-phenylene(PPP), poly-p-phenylenevinylene(PPV), polythiophene(PTh) ֽϴ.
̿ μ , , , ȣ ִµ, ū ̴ OLED , OLED Ͽ ۵ȴٴ ֽϴ. ̷ Ͽ ʹ , , 꼺 Ȯ ̰ . ڸ Ȯ ǰ ϱ OLED 뼼, , µ, ü OLED ū ϰ ֽϴ. ٸ, ܱ, ɰ Բ (ũ) , ػ ް Ǵ ̼ ʹ ̵ Ǯ Դϴ.
" ְ ظ ϰ , ο ڷ پϿ ǥ , ٶϴ.”
<۱ڨ 'öƽ̾' - .>
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