Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue

Table 1

Effects of dopant concentration and carrier modulating layer thickness on the color temperature span, color temperature, and color rendering index of the sunlight-style OLED devices studied.

Device

Dopant concentration [wt%]

CML thickness; (nm)

CT span (K)

CT (K)

CRI

Power efficiency; (lm/W)

Current efficiency; (cd/A)

1931 CIE coordinates

Operating; voltage (V)

Maximum; luminance (cd/m^2)

Ist EML

IInd EML

Yellow

Red

Blue

@100/l,000 cd/m^2

I-1

2

0.3

10

—

2,460–9,340

2,980/4,530

84.3/80.8

4.0/2.7

5.7/5.4

(0.42, 0.38)/(0.35, 0.35)

4.5/6.1

10,800

I-2

2

0.5

10

—

2,170–8,990

2,940/4,410

85.2/82.1

4.0/2.4

5.7/4.7

(0.43, 0.38)/(0.36, 0.35)

4.5/6.2

10,270

I-3

4

0.5

15

—

2,290–9,280

2,980/4,540

80.7/84.4

3.9/3.1

5.7/6.0

(0.42, 0.38)/(0.35, 0.35)

4.6/6.2

10,160

II-1

2

0.3

10

3

2,900–4,890

3,060/3,870

83.6/84.5

4.3/2.9

5.9/6.0

(0.42, 0.38)/(0.38, 0.37)

4.3/6.4

4,990

II-2

2

0.3

10

5

2,570–4,270

2,860/3,380

80.1/82.0

4.5/2.7

6.3/5.7

(0.44, 0.39)/(0.41, 0.38)

4.5/6.6

4,750