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PHOTOLUMINESCENT
About Emitting Color
Question.1

What is the luminance standard for Photoluminescent Material ?

Answer.1

JIS Z 9107 (Japanese Industrial Standard) and DIN67510 (German Industrial Standard) define the luminance.
The following table shows the luminance above-mentioned two Standards define.

Luminance(mcd/m2)
Time
5min
10min
20min
60min
JIS Z 9107
110
50
24
7
DIN 67510-1
60
30
-
5

DIN67510, concerning the photoluminescent pigment and its applied products,
defines the limit of luminance we can recognize by the naked eye is 0.3mcd/m2.
The following table shows luminance standard. (from our experiment data)

Luminanc
(mcd/m2)
Visibility in darkness
Visible
Invisible
Over5
Very bright and clearly visible
10/10persons
0/10persons
Under3
Outline is visible
10/10persons
0/10persons
Under2
Dimply visible
10/10persons
0/10persons
Under1
Nearly invisible
3/10persons
7/10persons

Question.2

What is the shape of Photoluminescent Material ?

Answer.2 When initially calcined, it is clumpy. Later it is pulverized into various grains of powder.
Question.3

What color do photoluminescent pigments emit in the dark?

Answer.3

We are now commercializing four colours; blue green, sky blue and orange.

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