Improved lifetime of an OLED using aluminum (III) tris (8-hydroxyquinolate)

T. S. Kim; D. H. Kim; H. J. Im; K. Shimada; R. Kawajiri; T. Okubo; H. Murata; T. Mitani

doi:10.1016/j.stam.2003.11.009

Improved lifetime of an OLED using aluminum (III) tris (8-hydroxyquinolate)

T. S. Kim, D. H. Kim, H. J. Im, K. Shimada, R. Kawajiri, T. Okubo, H. Murata, T. Mitani

Division of Nanotechnology

Japan Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Improved lifetime with enhanced efficiency of an Alq₃ based OLED was realized by the co-evaporation of hexamethylbenzene (HMB). Two different solvated crystalline systems of Alq₃, Alq₃(C ₇H₈)_1/2, Alq₃(C₂H ₅OH), were synthesized to investigate the effect of optically inactive materials on the emission properties of Alq₃. Clathrate solvents perturb the excited electronic states of Alq₃ so that the incorporated materials in OLEDs should be chemically and optically inactive to control polymorphs. HMB acts as a carrier blocker for both electrons and holes. However, Alq₃ may be stabilized from Joule heat if the Joule heat is efficiently consumed as the vibrational/rotational energy of HMB. Consequently, the self-quenching and the crystallization of Alq₃ are effectively suppressed by the HMB, resulting in prolonged operating time and enhanced efficiency for Alq₃-OLEDs.

Original language	English
Pages (from-to)	331-337
Number of pages	7
Journal	Science and Technology of Advanced Materials
Volume	5
Issue number	3
DOIs	https://doi.org/10.1016/j.stam.2003.11.009
State	Published - May 2004

Keywords

Alq
Hexamethylbenzene
Lifetime
Organic EL

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10.1016/j.stam.2003.11.009

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title = "Improved lifetime of an OLED using aluminum (III) tris (8-hydroxyquinolate)",

abstract = "Improved lifetime with enhanced efficiency of an Alq3 based OLED was realized by the co-evaporation of hexamethylbenzene (HMB). Two different solvated crystalline systems of Alq3, Alq3(C 7H8)1/2, Alq3(C2H 5OH), were synthesized to investigate the effect of optically inactive materials on the emission properties of Alq3. Clathrate solvents perturb the excited electronic states of Alq3 so that the incorporated materials in OLEDs should be chemically and optically inactive to control polymorphs. HMB acts as a carrier blocker for both electrons and holes. However, Alq3 may be stabilized from Joule heat if the Joule heat is efficiently consumed as the vibrational/rotational energy of HMB. Consequently, the self-quenching and the crystallization of Alq3 are effectively suppressed by the HMB, resulting in prolonged operating time and enhanced efficiency for Alq3-OLEDs.",

keywords = "Alq, Hexamethylbenzene, Lifetime, Organic EL",

author = "Kim, {T. S.} and Kim, {D. H.} and Im, {H. J.} and K. Shimada and R. Kawajiri and T. Okubo and H. Murata and T. Mitani",

year = "2004",

month = may,

doi = "10.1016/j.stam.2003.11.009",

language = "English",

volume = "5",

pages = "331--337",

journal = "Science and Technology of Advanced Materials",

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T1 - Improved lifetime of an OLED using aluminum (III) tris (8-hydroxyquinolate)

AU - Kim, T. S.

AU - Kim, D. H.

AU - Im, H. J.

AU - Shimada, K.

AU - Kawajiri, R.

AU - Okubo, T.

AU - Murata, H.

AU - Mitani, T.

PY - 2004/5

Y1 - 2004/5

N2 - Improved lifetime with enhanced efficiency of an Alq3 based OLED was realized by the co-evaporation of hexamethylbenzene (HMB). Two different solvated crystalline systems of Alq3, Alq3(C 7H8)1/2, Alq3(C2H 5OH), were synthesized to investigate the effect of optically inactive materials on the emission properties of Alq3. Clathrate solvents perturb the excited electronic states of Alq3 so that the incorporated materials in OLEDs should be chemically and optically inactive to control polymorphs. HMB acts as a carrier blocker for both electrons and holes. However, Alq3 may be stabilized from Joule heat if the Joule heat is efficiently consumed as the vibrational/rotational energy of HMB. Consequently, the self-quenching and the crystallization of Alq3 are effectively suppressed by the HMB, resulting in prolonged operating time and enhanced efficiency for Alq3-OLEDs.

AB - Improved lifetime with enhanced efficiency of an Alq3 based OLED was realized by the co-evaporation of hexamethylbenzene (HMB). Two different solvated crystalline systems of Alq3, Alq3(C 7H8)1/2, Alq3(C2H 5OH), were synthesized to investigate the effect of optically inactive materials on the emission properties of Alq3. Clathrate solvents perturb the excited electronic states of Alq3 so that the incorporated materials in OLEDs should be chemically and optically inactive to control polymorphs. HMB acts as a carrier blocker for both electrons and holes. However, Alq3 may be stabilized from Joule heat if the Joule heat is efficiently consumed as the vibrational/rotational energy of HMB. Consequently, the self-quenching and the crystallization of Alq3 are effectively suppressed by the HMB, resulting in prolonged operating time and enhanced efficiency for Alq3-OLEDs.

KW - Alq

KW - Hexamethylbenzene

KW - Lifetime

KW - Organic EL

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U2 - 10.1016/j.stam.2003.11.009

DO - 10.1016/j.stam.2003.11.009

M3 - Article

AN - SCOPUS:2342596472

SN - 1468-6996

VL - 5

SP - 331

EP - 337

JO - Science and Technology of Advanced Materials

JF - Science and Technology of Advanced Materials

IS - 3

ER -

Improved lifetime of an OLED using aluminum (III) tris (8-hydroxyquinolate)

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Keywords

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