SYSTEMS DIVISION

LL07 RANGE

MINIATURE FLUORESCENT BULBS

Semelab plc

Telephone (01455) 556565

Fax (01455) 552612.

E-mail: sales@semelab.co.uk

Web site: http://www.semelab.co.uk

Prelim. 10/98

Semelab Plc. reserve the right to change the products shown on this datasheet in the interest of improved specification. No responsibility is assumed for the use of

information contained herein, nor for any infringement of patent or rights of others that may result from such use. No license is granted by implication or otherwise

under any patent or patent right of Semelab Plc.

THE LL07 RANGE OF MINIATURE

FLUORESCENT BULBS

APPLICATIONS:

MEASUREMENTS

FEATURES:

UV,BLUE, WHITE, GREEN, AND RED

MECHANICAL DATA

Dimensions in mm

Anode

Electrons

Heated

Cathode

5.3V

Mercury

Atoms

Phosphor

Coating

24V

1KOhm

DESCRIPTION

The LLO7 devices are a range of miniature fluorescent bulbs. The device structure has been designed to give maximum

radiant intensity with low voltage operation.

The principal difference between the miniature and a conventional fluorescent lamp is the filament cathode. When

powered up, electrons are emitted from the cathode by thermionic emission. These electrons are then accelerated towards

the anode due to the potential difference between the anode and cathode. The electrons collide with mercury atoms and

excite an orbital electron. The electron decays to a lower energy level and emits a photon of short wavelength ultra-violet

light. This photon stimulates the phosphor coating on the inside of the glass bulb.

Depending on the type of phosphor used red, green, blue, white or long wavelength ultra-violet light is emitted from the

device. The short wavelength ultra-violet light is absorbed by the glass bulb. See diagram.

The dimensions are subject to a typical tolerance of +0.5mm. Advice on suitable materials to encapsulate the bulbs is

available from Semelab Plc.

Anode

Cathodes

11.0

6.0

16.5

39.0

5.0

7.0