JPS6282641A - Discharge lamp for ultraviolet rays - Google Patents

Abstract

PURPOSE:To increase the output of each spectrum of magnesium by encapsulating predetermined quantity of iron in a magnesium vapor discharge lamp. CONSTITUTION:About 170mg of mercury sufficient for sustaining arc discharge, about 1X10<-5>mol of magnesium iodide, about 15mgHg of argon gas, halogen and proper quantity of iron, or about 1X10<-6>mol of iron iodide per 1cc of the inner volume of a light emission tube are encapsulated in the light emission tube 1. When lighting under such condition, the light emission spectrum of magnesium will increase considerably when compared with the case where iron iodide is not encapsulated. The light emission spectrum of magnesium when lighting while encapsulating 30X10<-6>mol of iron iodide will increase when compared with the case where iron iodide is not added to provide a continuous spectrum of 350-400nm. In such a manner, the output of each spectrum of magnesium can be increased corresponding to the quantity of iron iodide to be added.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp for an ultraviolet light source used in photochemical reactions and the like.

[Prior art and its problems]

In order to cause a photochemical reaction, the wavelength range is approximately 250 ~
A discharge lamp is used that effectively emits ultraviolet radiation in the range of 400 fLrn. Conventionally, high-pressure mercury lamps and ultra-high-pressure mercury lamps are often used as discharge lamps, but the light emitted from high-pressure mercury lamps consists of many bright line spectra, and each spectrum has a fairly wide wavelength range. However, using a high-pressure mercury lamp for a photochemical reaction whose effective wavelength range is in the above-mentioned range has problems in terms of efficiency.

For this reason, metal vapor discharge lamps are often used in which a metal halide is sealed as a luminescent substance in the arc tube of a high-pressure mercury lamp to increase the amount of light emitted in an effective wavelength range. In particular, a magnesium vapor discharge lamp filled with red sium has a spectral output of 279, 285, 309, 38 in addition to that of mercury.
Efficiency is improved due to the additional 3.384 nm spectral power.

However, each spectral output newly generated by enclosing magnesium is smaller than that of mercury, and the ultraviolet output in the effective wavelength range for photochemical reactions of a magnesium vapor discharge lamp is lower than that of a pressurized mercury lamp. There is no big difference.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to increase the spectral output of magnesium in a magnesium vapor discharge lamp, and to provide an ultraviolet discharge lamp with a large output in a wavelength range effective for photochemical reactions and the like.

[Structure of the invention]

The structure of the present invention is to provide a magnesium vapor discharge lamp in which an appropriate amount of magnesium and halogen are sealed inside an arc tube equipped with an eL pole, along with mercury and rare gas sufficient to maintain arc discharge. It is characterized by additionally encapsulating iron.

That is, in order to achieve the above-mentioned object, the inventor found that it is effective to add and enclose iron in a magnesium vapor discharge lamp, and after conducting various experiments, the present invention was completed. And 279.285 of magnesium
．． In order to increase the output of the emission spectrum of 309.383.384 nm, the amount of iron added may be extremely small;
For example, I x 10-' per inner volume ICC of the arc tube
It was confirmed that a sufficiently large effect can be obtained by adding molar amounts. In addition, if the addition amount of iron is increased, almost no adverse effects will be observed, and the iron halide will emit light, causing 3
The output of a continuous spectrum in the wavelength range of 50 to 400 nm increases.

Generally speaking, if the photochemical reaction requires a wavelength range of 350 to 400 nm, the amount of iron added should be increased; conversely, if a continuous spectrum is not convenient, the amount of iron added should be reduced. , it is only necessary to increase the emission spectrum of magnesium. In history, there are 270 to 300 photochemical reactions.
When a short wavelength range of nm is required, the continuous spectrum of iron is extremely weak in this range, so the amount of iron added can be arbitrary. The output of the spectrum can be used. In this way, it is preferable to use the amount of iron added depending on the type of photochemical reaction targeted.

〔Example〕

Embodiments of the present invention will be specifically described below based on the drawings.

Figure 1 shows a 4K rating used as a light source for photochemical reactions.
W magnesium vapor discharge lamp is shown.

A pair of electrodes 2.2 are arranged facing each other in an arc tube 1 made of a quartz tube with an inner diameter of 22 mm and an internal volume of about 100 mm, and the distance between the electrodes is 250 mm. Both ends of the arc tube 1 are 7-1.
1, molybdenum wi3 is sealed in the seal portion 11, and the column conducting wire 4 and the electrode 2 are electrically connected via this molybdenum w33.

Inside the arc tube 1, there are 170 water tubes, I x 10-'
It is filled with mol of magnesium iodide and 15 fiHg of argon gas. Then, add iron iodide to this
10"-' moles and 30 x 10-' moles were added and sealed, and as a comparative example, 3 $11 class discharge lamps were lit at an electrical input of 4 KW, and each luminescence was measured. The spectral distribution was measured. The results are shown in Figure 2 for the case with 1X10"-' mol of iron iodide, Figure 3 for the one with 30 x 10'" 6 mol, and the one without addition. are shown in Figure 4.

As you can see, compared to Figure 4 without adding iron,
In FIG. 2, when I x 10-' moles of iron iodide are added, the emission spectra of magnesium all increase significantly, confirming that the effect is large. Next, in Figure 3, where the amount of iron iodide added is increased to 30 x 10-' moles, the emission spectrum of Magne/Rum tends to decrease somewhat compared to Figure 2, where there are fewer addition needles. , Compared to Munaka's 4th figure, the sound of the dog has increased in both cases.
Furthermore, the emission spectrum of iron is in the wavelength range of 350 to 400 nm.
appears as a continuous spectrum.

Therefore, it was confirmed that by adding a small amount of iron, it was possible to greatly increase the output of the emission spectrum of magnesium, and as the amount of iron added was further increased, a continuous spectrum of iron appeared. Therefore, the amount of iron added can be adjusted depending on the wavelength range, 14-line, and continuous spectrum required for the photochemical reaction, and an ultraviolet discharge lamp optimal for the photochemical reaction can be obtained.

Furthermore, the addition of iron has almost no effect on electrical characteristics such as starting voltage and both ignition voltages.

〔Effect of the invention〕

As explained above, in the present invention, since an appropriate amount of iron is added to a magnesium vapor discharge lamp, the output of each emission spectrum of magnesium can be greatly increased. Therefore,
An ultraviolet discharge lamp suitable for photochemical reactions having an effective wavelength range of 250 to 400 nm can be obtained. Furthermore, by adjusting the amount of iron added, mainly 350
It has the advantage of being able to change the output and spectral shape in the range of ~400 nm, matching the characteristics of the applied photochemical reaction.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a magnesium discharge lamp, FIGS. 2 and 3 are illustrations of the emission spectrum of an embodiment of the present invention, and FIG. 4 is an illustration of the emission spectrum of a conventional example.

Claims (1)

[Claims] A magnesium vapor discharge lamp has an appropriate amount of magnesium and halogen sealed inside an arc tube equipped with electrodes, along with sufficient amounts of mercury and rare gas to maintain arc discharge.
An ultraviolet discharge lamp characterized by containing an appropriate amount of iron.