Table 14 CIE coordinate, color purity, and CCT of La2O3:Tm/Eu.

From: Energy transfer and multicolour photoluminescence in phosphors La2O3 doped by Tm3⁺, Ho3⁺, and Eu3⁺ for white LED and security applications

La2O3:Tm3+/Eu3+

Sr. No

Name

x

y

xd

yd

CCT (k)

Color Purity (%)

1

La2O3:Tm3+(1.5 mol%)/Eu3+(1.0 mol%)

0.252

0.186

0.148

0.025

2143.21

42.77

2

La2O3: Tm3+(1.5 mol%)/Eu3+(2.0 mol%)

0.259

0.202

0.147

0.027

1937.9

37.67

3

La2O3: Tm3+(1.5 mol%)/Eu3+(3.0 mol%)

0.264

0.202

0.145

0.028

2041.07

37.07

4

La2O3: Tm3+(1.5 mol%)/Eu3+(4.0 mol%)

0.253

0.181

0.147

0.027

1750.49

44.19

5

La2O3: Tm3+(1.5 mol%)/Eu3+(5.0 mol%)

0.306

0.277

0.148

0.025

1758.54

11.81

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