电激发光高分子材料PLED

能發光最美電激發光高分子材料(PLED)國立成功大學化工系陳雲專長:高分子化學、電激發光高分子材料(PLED)、液晶高分子材料、高分子奈米材料、聚氨酯材料1PLED的研究始於1990年英國劍橋大學Friend等人的研究，發現共軛高分子可做為發光二極體材料，❹將Poly(p-phenylene

vinylene)(PPV)製作成有機電激發光件，其結構為ITO/PPV/Ca，此元件發黃綠光。PLED具備了自發光、高應答速度、視角廣、省電、厚度薄、可撓曲、高亮度、可全彩化等優點。2Organic

light-emitting

diodes

(OLED)

and

Polymer

light-emitting

diodes

(PLED)

are

two

potential

luminescent

materials

for

flat

panel

display

inthe

near

future.

They

showmany

advantages

over

current

thin

film

transistor

display

LCD

such

as

self

emission,

wide

view

angle,

simplemanufacturing

process,

and

many

others.

Here

are

some

small-sized

display

panels

that

have

been

commercialized

recently.

For

example,

this

isPDA

from

Ritek

Display

of

Taiwan,

and

……New

Flat

Panel

Display:Organic

light-emitting

diodes

(OLED)Polymer

light-emitting

diodes

(PLED)3OLED4LCDPhotoluminescence

is

the

radiation

emitted

asa

resultof

relaxation

fromsinglet

photoexcited

molecule

to

ground

state.

Similarly,

the

excitation

ofluminescent

molecules

can

also

be

aroused

by

an

electric

potential.

Usingsingle

layer

OLEDdevice

as

an

example,

under

the

drive

of

electricfield

the

electron

inject

frommetal

cathode

and

the

hole

inject

fromanode,

usually

transparent

ITO

glass.

They

combine

in

the

emitting

layer

toformas

exciton

and

then

relaxes

to

the

ground

state

byemitting

light.

The

electroluminescent

materials

are

roughlydivided

into

low

molecularweight

compounds

and

polymers.For

most

conjugated

polymers,

electroninjection

barrier

is

higher

thanhole

injection

barrier.

This

imbalance

in

charge

injection

is

usually

solvedby

multilayer

strategy.Metal

cathodeEmitterITO

anodeGlass⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕

⊕Structure

of

Single

Layer

OLEDIntroduction*

Photoluminescence

(PL)*

Electroluminescence

(EL)*

EL

MaterialsSoT1S2S1hn5發光效率LUMO6CathodeHOMOAnodeLow

molecular

weight

materials:

(vacuum

deposition) Metal

chelatesOrganic

chromophoresCharacteristics:

higher

efficiency,

higher

brightness,lower

mechanical

strength.Polymers:

(spin

coating

or

ink-jet

printing) Fully

conjugated

polymeric

systemMain

chain

polymers

with

isolated

chromophoresSide

chain

polymers

with

linked

chromophoresPolymers

blending

with

low

molecular

weight

materialsCharacteristics:

unique

processability,

mechanical

flexibilityfew

recrystallization

processes.7·

發光元件用材料8合成新型電激發光高分子材料，探討其結構與發光特性之關係，❹製備發光二極體元件探討其光電性質。製備電激發光高分子奈米複合材料，探討奈米環境對發光特性的影響。樹枝狀發光高分子(Dendrimer)的分子設計與製備，探討樹枝狀結構對改善發光高分子因凝集所造成光

電特性降低的可行性。利用活性自由基聚合法製備側鏈型電激發光高分子材料，探討結構與光電特性之間的關聯。9目前主要研究領域:In

order

to

explain

the

mechanismmore

clearly,

I

use

this

graph

to

represent

the

combinationof

both

electron-

and

hole

transporting

segmentsinto

backbone

simultaneously.

Under

electric

potential,

electron

inject

into

LUMO

of

electron

transporting

segments

and

hole

inject

into

HOMOof

hole

transporting

segments.

In

other

words,

they

select

the

lowest

energy

barrier

to

jump

into

copolymers.

Therefore,

energy

barriers

of

bothcharges

are

reduced.ETS

or

ELElectron

transport

/Emitting

chromophoreHole

transport

/Emitting

chromophore(HTS

or

ELITOAlITOAlΘo

)n10oIsolated

EL

CopolymersCurrent

Density

(open)-Voltage-Luminance

(solid)

characteristicof

single

layer

LED

device[ITO/P1

(100

nm)/Al].11EL

max=

425

nm12EL

max=

480

nmEL

max

=

452

&

550

nm陳雲Current