DOE research and development of a new type of wafer photoreceptor

[LED] China's Ministry of energy (DOE) Ames Laboratory (hereinafter referred to as the Ames laboratory) to develop a kind of ultraviolet complete organic light emitting body (OLED), can be used as a chip type photosensitive sensor.

This is the first study to allow scientists to operate in special areas of the invisible light, ultraviolet wavelengths of about 400 nm (nm).

Ames (Joseph Shinar) laboratory scientist Joseph Schne said: "we really want to achieve the goal is to produce a spectrometer can be used to measure all capable of emitting light or light absorbing objects by absorption of light or cold luminescence spectroscopy (luminescence spectrum). "

The United States Department of energy's Ames laboratory has developed a near ultraviolet complete organic light emitting diode (OLED), which can be used as a wafer type sensor. (photo: Ames Laboratory)

Since many people interested in OLED, is that most of this technology could be replaced the traditional LED technology, LED is widely used in consumer electronics products, therefore, the related research on OLED and UV spectra of less. Laboratory scientist Ruth Schne (Ruth Shinar) explained: "because of this, we have ignored the application of OLED in small size, flexible device analysis device needs to emerge, this kind of device can be used to detect water quality, food safety, medical diagnosis and other application in biosensor. Characteristics of such devices include the ability to hold hands, use in a variety of areas, and may be inexpensive to use in a disposable manner. "

The researchers carefully, explore the impact of microcavity, micro cavity structure is a reflective surface or two interface. A small cavity will change the wavelength of light. These features allow UV OLED to issue a more concentrated light, which can be used to detect, stimulate the spectrum. With this OLED array, different analysis and optical excitation can be performed on the same device.

Study on the micro cavity of Ames OLED according to the laboratory, the researchers created a can emit wavelengths between 370 to 430 nm light, color is dark blue and near ultraviolet, this result is a continuation of the previous research results of scientists. Graduate student Astad Manna (Eeshita Manna) to carry out the experimental process, scientists (Rana Biswas) excitation spectrum.

To undertake research previously working in the laboratory of Emily Hellerigu (Emily Hellerich) the results of the study, this time the researchers borrowed materials CBP and PVK by the use of unique photosensitive polymerization, extended to 470 nm. Prior to the further integration of the visible light OLED array cavity, scientists can therefore get a wavelength range of 370 nm to 640 nm.

The following two papers discuss the study:

Tunable Near UV OLED Arrays: and Analytical Applications, published in Advanced Functional Materials Microcavity Characterizations

Deep Blue/ultraviolet microcavity based solution-processed PVK:CBP blends, published in Organic Electronics OLEDs on

(compile: China LED network /Emmachang)

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