US20050279949A1 - Temperature control for light-emitting diode stabilization - Google Patents
Temperature control for light-emitting diode stabilization Download PDFInfo
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- US20050279949A1 US20050279949A1 US10/981,440 US98144004A US2005279949A1 US 20050279949 A1 US20050279949 A1 US 20050279949A1 US 98144004 A US98144004 A US 98144004A US 2005279949 A1 US2005279949 A1 US 2005279949A1
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Definitions
- the present teachings relate to an optical instrument using excitation beams generated by a light-emitting diode.
- LEDs Light-Emitting Diodes
- optical detection for example, in fluorescent measurement.
- LED excitation beam source that does not exhibit beam intensity changes and/or spectral shift.
- a device compatible with nucleotide amplification reactions, detecting such reactions, and capable of processing a relatively large number of amplification reactions is desirable.
- a system includes one or more light-emitting diode (LED), a temperature sensor, and a temperature regulator.
- the temperature sensor can be in thermal contact with the LED, can be capable of measuring an operating temperature, and can be capable of generating an operating temperature signal.
- the temperature regulator can be capable of receiving an operating temperature signal of the LED and regulating the operating temperature based on the operating temperature signal.
- LED what is meant is at least one LED, and that a group or array of LED's can be included in an “LED” as described herein.
- a method for illuminating a reaction region with excitation beams can include providing a system that includes an LED and a reaction region.
- the method can include generating excitation beams with the LED; directing the excitation beams toward the reaction region; measuring an operating temperature of the LED; and regulating the operating temperature by transferring heat away from and/or into the LED, based on the measured operating temperature.
- the reaction region can include a sample retained therein.
- a method for illuminating a reaction region with excitation beams can include providing a system that includes an LED and a reaction region.
- the method can include generating excitation beams with the LED; directing excitation beams to the sample; detecting an optical property of the sample to obtain detection data; measuring the operating temperature of the light emitting diode; and adjusting the detection data based on the operating temperature.
- the adjustment can be made, for example, by shifting the detection data.
- the shifting of the detection data can include, for example, a shift in intensity, spectra, or both.
- FIG. 1 is a side view in partial cross-section of a system including a heater providing temperature stabilization for an LED array according to various embodiments;
- FIG. 2 is a view in partial side cross-section of a system including a thermoelectric device providing temperature stabilization for an LED array according to various embodiments;
- FIG. 3 a is a side view in partial side cross-section of a system including a fan and cooling fins providing temperature stabilization for an LED array according to various embodiments;
- FIG. 3 b is a top plan view of a capillary sample holder according to various embodiments.
- FIG. 4 is a top view in partial cross-section of a system including a fan and heating element providing temperature stabilization for an LED according to various embodiments.
- FIG. 5 is a side view in a partial cross-section of a system providing a strong thermal conductive path according to various embodiments.
- a system includes one or more light-emitting diode (LED), a temperature sensor in thermal contact with the LED, and a temperature regulator.
- the temperature sensor can be capable of measuring an operating temperature and generating a signal.
- the signal can include an operating temperature signal.
- the signal can be a digital signal.
- the digital signal can be indicative of whether the temperature being sensed is above or below a set point.
- the temperature sensor can generate a signal without thermal contact with the LED.
- the temperature sensor does not have to directly generate an operating temperature signal but rather can simply indicate whether a temperature is above or below a set point.
- the temperature regulator can be capable of receiving the operating temperature signal and regulating the operating temperature based on the operating temperature signal.
- the system can include a heat-transfer device and a control unit capable of controlling the heat-transfer device.
- the heat-transfer device can include a fan capable of forming an air current in thermal contact with the LED.
- the heat-transfer device can include a cooling fin in thermal contact with the LED.
- the heat-transfer device can include a heater in thermal contact with the LED.
- the heat-transfer device can include a thermoelectric device in thermal contact with the LED.
- the thermoelectric device can be connected to a reversible-DC-power supply.
- the temperature regulator can include a temperature system that can be capable of increasing and/or decreasing the operating temperature of the LED.
- the temperature regulator can comprise a system adapted to control excitation of one or more fluorescent dyes.
- the temperature regulator can be adapted such that it is capable of maintaining the operating temperature within an operating temperature range including a minimum temperature and a maximum temperature separated by, for example, about 15° C., about 5° C., about 1° C., or about 0.5° C.
- the operating temperature range can also be specified as a nominal temperature and an acceptable deviation value range.
- the temperature regulator can be a temperature regulating system that can include a user input device that is capable of being programmed to maintain an operating temperature range including a minimum temperature and a maximum temperature.
- the system can include a display capable of displaying the operating temperature signal.
- the system can include an error signaling device capable of signaling an alarm when the operating temperature is greater than a maximum temperature.
- the error signaling device can signal an alarm when the operating temperature is less than a minimum temperature.
- the system can include a substrate in contact with the LED.
- the substrate can include, for example, a Printed-Circuit Board (PCB).
- the reaction region can include a sample retained therein.
- the sample can include one or more nucleotide.
- the reaction region can include reagents necessary to perform a nucleic acid sequence amplification reaction.
- the sample can include fluorescent dyes, labels, or markers.
- the system can include a detector capable of detecting an optical property of the reaction region.
- the temperature sensor can include a thermister, a thermocouple, a resistance temperature detector (RTD), a bandgap semiconductor temperature sensor, a non-contact temperature sensor, a bandgap semiconductor resistive temperature detector, a platinum resistive temperature detector, a bi-metallic temperature detector, a combination thereof, or the like.
- RTD resistance temperature detector
- bandgap semiconductor temperature sensor a non-contact temperature sensor
- bandgap semiconductor resistive temperature detector a platinum resistive temperature detector
- bi-metallic temperature detector a combination thereof, or the like.
- FIG. 1 is side cross-sectional view of a system 100 , according to various embodiments, including an LED array 110 that includes a plurality of LEDs 111 .
- the system can also include a focal lens 106 .
- the focal lens 106 can focus excitation beams emitted by the LED array 110 .
- the LED array 110 can be in physical and/or thermal contact with a substrate 112 .
- the LED array 110 can include one or more rows or patterns of individual LEDs.
- the substrate 112 can be a PCB.
- a heating device 116 for example, a resistive heating element, can be provided in thermal contact with the LED array 110 .
- the heating device 116 can be included in, on, or in and on the substrate 112 .
- the system 100 can include a temperature sensor 118 in thermal contact the LED array 110 .
- the temperature sensor can be centrally located with respect to the LED array 110 .
- the temperature sensor 118 can be included on the substrate 112 .
- a temperature regulator or temperature regulating system 122 can be provided that is capable of receiving a signal from the temperature sensor 118 .
- the temperature sensor 118 and temperature regulating system 122 can be integrated and/or can be of a unitary construction.
- the temperature regulating system 122 can control the heating device 116 .
- the temperature regulating system 122 can control a fan 114 .
- the temperature regulating system 122 can control the fan 114 and the heating device 116 .
- the temperature regulating system 122 can be used to control the heating device 116 to reach or maintain a nominal operating temperature while the fan 114 prevents the operating temperature from getting too high. This optimization can be used, for example, if the LED array 111 is not continuously on.
- the fan 114 can direct an air current over one or more cooling fins 104 .
- the cooling fins 104 can be in thermal contact with the LED array 110 , with the substrate 112 , or with both.
- the temperature regulating system 122 can send signals to and/or receive signals from the temperature sensor 118 , the heating device 116 , and/or the fan 114 .
- the temperature regulating system 122 can send and receive signals using wires 120 .
- Excitation beams can be emitted from LED array 110 and directed to one or more reaction region 108 .
- the reaction region 108 can include a sample 107 .
- the reaction region can be a microtiter tray.
- FIG. 2 is a side cross-sectional view of a system 200 , according to various embodiments, that includes a temperature stabilization device for an LED array 210 , for example, by including a plurality of LEDs 111 .
- a focal lens 206 can be included to focus excitation beams emitted from each of the individual LEDs 211 .
- the LED array 210 can be in physical and/or thermal contact with a substrate 212 .
- the system 200 can include a temperature sensor 218 in thermal contact with the LED array 210 , the substrate 212 , or both.
- the temperature sensor 218 can be included in or on the substrate 212 .
- a temperature regulating system 222 can receive a signal from the temperature sensor 218 .
- the temperature regulating system 222 can control a thermoelectric device 214 , for example, a Peltier device.
- the thermoelectric device 214 can be in thermal contact with the LED array 210 , with substrate 212 , or with both.
- the thermoelectric device 214 can transfer thermal energy from an ambient environment to the LED array 210 .
- the thermoelectric device 214 can transfer thermal energy to an ambient environment from the LED array 210 .
- the thermoelectric device 214 can include a temperature sensor.
- a plurality of cooling fins 204 can be in thermal contact with the LED array 210 and/or with the thermoelectric device 214 .
- the temperature regulating system 222 can send signals to and/or receive signal from the temperature sensor 218 , and/or the thermoelectric device 214 , for example, through wires 220 .
- Excitation beams can be emitted from LED array 210 and can be directed to a plurality of reaction regions 208 , for example, held in a thermal cycling block 230 .
- the thermoelectric device 214 can be used to maintain a lower temperature than could be otherwise achieved under operating conditions. This can permit the LED array 210 to operate more efficiently, with a higher total flux output.
- the thermoelectric device 214 can be used in a heating mode, for example, to reach or maintain a temperature when the LED array 210 is not on.
- the thermoelectric device 214 can be used in a cooling mode when the duty cycle of the LED array 210 is high enough to require cooling.
- FIG. 3 a is a side cross-sectional view of a system 300 according to various embodiments and capable of providing temperature stabilization for an LED array 310 including a plurality of individual LEDs 311 .
- a focal or collimating lens 306 can be included to focus excitation beams emitted from each of the individual LEDs 311 .
- the collimating lens can be a Fresnel lens.
- a beam splitter 307 can be included to separate excitation beams from emission beams.
- the beam splitter 307 can be replaced by a filter or beam splitter as described, for example, in U.S. patent application Ser. No. 10/735,339, filed Dec. 12, 2003, which is incorporated herein in its entirety by reference.
- the LED array 310 can be in contact with a substrate 312 .
- the system 300 can include a temperature sensor 318 in thermal contact with the LED array 310 .
- the temperature sensor 318 can be included in, on, or in and on the substrate 312 .
- a temperature regulating system 322 can receive a signal from the temperature sensor 318 .
- the temperature regulating system 322 can control a fan 314 .
- the fan 314 can direct an air current over a plurality of cooling fins 304 .
- the cooling fins 304 can be in physical and/or thermal contact with the LED array 310 .
- the temperature regulating system 322 can communicate with the temperature sensor 318 , and/or the fan, through wires 320 .
- Excitation beams can be emitted from LED array 310 and directed to a reaction region 308 formed or disposed in, on, or in and on a substrate 309 .
- the reaction regions can include capillaries 330 of a capillary array.
- the capillaries 330 can each have a portion that passes through a detection zone 356 .
- the temperature control system can include a heater.
- the system can include a cooler.
- the system can include both a heater and a cooler. Cooling and heating rates can be augmented by using a plurality of heaters and/or coolers as desired. If a heater is provided, it can comprise a plurality of different types of heating devices. If a cooler is provided, it can comprise a plurality of different types of cooling devices.
- FIG. 3 b is a top plan partial view of the array of capillaries 330 shown in FIG. 3 a , and the detection zone 356 .
- the capillaries can traverse the detection zone 356 , where excitation beams from the LED array 310 ( FIG. 3 a ) can be directed.
- the excitation beams can be used for fluorescence detection of analytes in capillaries of a capillary electrophoresis device. Such can be the case in DNA sequencing and fragment length analysis applications.
- An LED illumination system can provide consistent illumination, can be light in weight, and can require minimal cooling and/or heating.
- the LED can be a standard semi-conductor device, an organic LED, or an inorganic LED. Examples of organic LEDs are QDOT-based LEDs and a nanotube-based LEDs.
- the LED can be a stack of LED's such as a stack of organic LEDs or a stack of organic LED layers.
- LEDs producing several different excitation wavelengths can be used, either simultaneously or sequentially.
- the use of a plurality of different excitation wavelengths can improve the calibration matrix necessary to distinguish fluorescence emissions of various dyes.
- a system can comprise LEDs, photodiodes, operational amplifiers, and LED-current control circuits.
- the components of the system can change properties with operating temperature variations.
- a temperature regulating system can maintain these components at a constant temperature.
- the constant temperature can be elevated from an ambient temperature.
- the constant temperature can be lower than an ambient temperature.
- the system components can be held at a constant temperature above an ambient temperature using a resistive heating element as a heat source under the control of the temperature regulating system.
- a strong or high thermal conductivity pathway can be used between the system components, for example, to the temperature sensor from a heat source and/or a heat sink.
- the temperature sensor can be used to measure directly, indirectly, or by calculation, the temperature of the system components.
- the temperature sensor can measure an operating temperature for various components of the system.
- the temperature sensor can provide feedback to a temperature regulating system.
- the temperature regulating system can monitor the amount of heating or cooling provided by a heat source or a heat sink to maintain the system components at a nominal temperature within an acceptable deviation value range.
- the temperature control characteristics of a temperature regulating system can be improved by enclosing the system components in a thermally isolated environment.
- the system components and the temperature sensor, and/or the temperature regulating system can be placed in an enclosure or housing.
- the enclosure can have openings for allowing illumination from the LEDs to illuminate a detection zone.
- Heat exchange pathways can be disposed in the enclosure to allow for thermal transfer between the system and an ambient environment.
- the heat exchange pathway can be a vent in the enclosure.
- a cooling fan can cool the thermally isolated environment provided by the enclosure.
- the heat exchange pathway can include, for example, a high conductivity thermal surface included in the enclosure and in thermal contact with a thermoelectric device.
- the system components can be separated from the enclosure using a thermal insulator to lower a heat exchange rate between the enclosure and the temperature control components.
- the temperature sensor can be in thermal contact with, in heat-transfer communication with, or otherwise thermally coupled to, the substrate.
- Known methods of heat transfer include, but are not limited to conduction, convection, and thermal radiation.
- a heat conductive adhesive or compliant pad can be used to attain good thermal conductivity between a heat sink or heat source, and other system components, for example, to maintain temperature stability in the system.
- a heat exchange pathway can be established for system components such as photodiodes and LEDs using a ground path to the same metal or layer plate, for example, in a PCB.
- the plate can be a metal, for example, aluminum, copper, or other electrically conductive metals.
- the system can thus maintain temperature stability and keep various system components at substantially the same temperature.
- the heat exchange pathway can exchange heat with the ground plate.
- Other temperature interface materials for example, adhesive backed resistive elements, can be used to achieve good contact with the system components.
- a resistive heater can be disposed in or on a common substrate shared with other electrical circuits included in the system.
- FIG. 4 is a top plan cross-sectional view of a system 400 .
- a housing 401 also known as a cave, an oven, or an enclosure, can include openings such as 403 and 407 as shown.
- LEDs 413 , 415 can irradiate through respective openings ( 403 ) to illuminate one or more reaction regions (not shown).
- the opening 407 can allow transmission or passing of emission beams from a reaction region to a detector 440 .
- One or more temperature sensor 418 can be disposed in or on a housing substrate 412 .
- the substrate 412 can include a heating device 416 .
- the temperature sensor 418 can be disposed on or in the housing substrate 412 .
- LEDs 413 and 415 , and detector 440 can be disposed on or in the housing substrate 412 .
- a temperature regulator or temperature regulating system 422 capable of receiving a signal from the temperature sensor 418 , can be included, for example, in the housing 412 .
- the temperature regulating system 422 can control the heating device 416 and/or a cooling fan 414 , as desired, for example, to maintain the system 400 within a desired or pre-set temperature range.
- the housing 401 can provide a relatively small, thermally isolated, volume to be temperature-regulated by the temperature regulating system 422 . Control circuits (not shown) necessary to utilize the LEDs 413 , 415 and the detector 440 can be housed within the housing 401 .
- Excitation beams can be emitted from the LEDs 413 , 415 and directed toward one or more reaction regions.
- LED 413 can produce excitation beams of a different wavelength range than LED 415 , for example, LED 413 can produce blue light and LED 415 can produce green light.
- LED 413 can be operated simultaneously or sequentially with LED 415 .
- FIG. 5 is a side cross-sectional view of a system 500 according to various embodiments.
- the system 500 can include photodiode detectors 550 , 552 , and 554 disposed on a substrate 574 .
- the substrate 574 can have control circuits 560 , 562 , 564 , and 566 disposed on a first surface or back side 575 thereof.
- the system 500 can include an LED 513 mounted on a plate 568 having a thermal conductivity of about 0.1 w/cm ⁇ k or higher, for example, about 0.3 w/cm ⁇ k or higher or about 0.5 w/cm ⁇ k or higher.
- the plate 568 can comprise, for example, aluminum, steel, stainless steel, another metal or alloy, a printed circuit board, or a combination thereof.
- An elastomer pad 570 having a high thermal conductivity can be disposed between the substrate 574 and the plate 568 .
- the substrate can be a multi-layer structure including a layer having a thermal conductivity of about 0.1 w/cm ⁇ k or higher.
- the elastomer pad 570 can electrically isolate an electric resistive heater 518 from the substrate 574 .
- the photodiode detectors 550 , 552 , and 554 can be adhered or bonded to the substrate 574 using, for example, an adhesive 572 .
- a temperature sensor 519 can be disposed in thermal contact with the system 500 , for example, the temperature sensor 519 can be disposed in contact with the plate 568 .
- Thermal insulation 576 can be disposed adjacent the second surface or backside 575 of the substrate 574 to thermally isolate the system 500 from an ambient environment.
- the system can maintain the control circuits 560 , 562 , 564 , 566 , the photodiode detectors 550 , 552 , 554 , and the LEDs 511 , 513 , at the same temperature. Accordingly, a constant and uniform temperature can be maintained across the system 500 .
- the LED or the LED array can include a plurality of LEDs mounted on a substrate.
- the LED can thermally contact a temperature regulating system.
- the temperature regulating system can control a heat-transfer device and/or a temperature sensor.
- the temperature regulating system can maintain the operating temperature of the LED such that the operating temperature does not change appreciably, by not more than 0.5° C., that is, does not fluctuate by more than 10° C. during operation, for example, by not more than 5° C., by not more than 1° C., by not more than 0.5° C., or by not more than 0.1° C. or less.
- the temperature regulating system can maintain the operating temperature of the LED such that the operating temperature does not exceed the bounds of a programmed temperature range.
- a temperature regulating system and a temperature sensor can be included in a single-unit or can be included in an integrated device, for example, a Maxim DS1620 device available from Maxim Integrated Products, Inc. of Sunnyvale, Calif.
- the temperature sensor and the LED do not necessarily have to be in physical contact.
- the temperature regulating system can adjust a monitored temperature of the LED to compensate for any thermal masses intervening between the LED and the temperature sensor and to thus derive, calculate, or estimate an operating temperature.
- the LED can be cooled to maintain life and illumination uniformity requirements of a system.
- a forced air cooling system or a thermoelectric device for example, a Peltier device, can be used to cool the LED and to keep the LED from exceeding a maximum operating temperature.
- the temperature of the LED can be monitored, for example, with a temperature sensor, and thermal characteristics of a system and spectral characteristics of any LEDs embedded within the system, can be recorded. With understanding and reproducibility of the spectral coefficients of the LED as a function of an operating temperature, the effects of a spectral shift can be mitigated upon detection of optical properties of a sample.
- a dye matrix or detection data can be altered in accordance with the conditions under which the dye matrix or detection data was gathered or detected. Thermal effects on excitation beams emitted by LEDs, including spectral shifts and intensity changes, can thus be minimized or effectively eliminated.
- the temperature of an LED can be monitored and a computing apparatus can adjust the detection data to compensate for the spectral shifts and/or intensity changes of excitation beams emitted from the LED.
- the compensation for the shifting can be varied across wavelength ranges, for example, different compensations can be provided for different wavelengths of LEDs.
- a system can be provided that can include a data adjustment unit comprising a memory adapted to store at least two operating temperatures and at least one respective excitation beam characteristic shift for each operating temperature.
- a plurality of respective excitation beam characteristic shifts can be stored in the memory.
- the adjustment data can be in the form of a plurality of respective coefficients. Each coefficient can correspond to a respective LED of an LED array.
- An exemplary range of coefficients can be from about 0.4 nm/° C.
- the coefficients can include two or more nominal temperature coefficients corresponding to two or more LEDs.
- the coefficients can be determined or designated based on the position of a respective LED in an LED array.
- optical detection instruments utilizing LEDs can obtain very stable intensity or spectral characteristics by stabilizing an operating temperature of an LED.
- Illumination stability can be important to minimize the signal noise in the system.
- Illumination stability can improve the sensitivity of the instrument to detect low concentration dyes.
- Spectral stability can be used to maintain values for the deconvolution matrix associated with a set of dyes to prevent quantification errors.
- variations in intensity resulting from temperature changes can be different for different wavelengths of LEDs, resulting in apparent spectral instability.
- illumination stability can be improved by allowing the illumination source to warm-up.
- shutters can block excitation beams from reaching a sample to prevent bleach out.
- shutters can block excitation beams from reaching a sample to prevent bleach out during illumination source warm-up.
- the illumination source can be brought to a desired operating temperature range prior to enabling or turning on the illumination source, using a heater and/or a cooler. Regulating the temperature of the illumination source prior to enabling the illumination source can prevent the need for a shutter and/or can reduce the warm-up time period.
- samples can be subjected to a reaction or a series of reactions, for example, temperature cycled in a nucleic acid sequence amplification or in a sequencing process.
- the shutter can be unblocked in co-ordination with the reaction or the series of reactions, to detect and collect data at an appropriate time, for example, during a fluorescence detection reading of the sample.
- sensitivity of the instrument to detect low concentration dyes can be used.
- An LED can shift, for example, 5% over a 15° C. ambient temperature range maintained by some optical instrumentation.
- a spectral shift of an LED can vary depending on a center wavelength of the LED, for example, blue LEDs can shift less than red LEDs.
- the spectral shift can be from about 0.04 nm/° C. to about 0.4 nm/° C.
- the spectral shift can be different for different temperatures.
- the spectral shift can be calculated.
- the spectral shift can be obtained from a look-up table.
- the table can be sorted by temperature, for example.
- the table can be provided in a long-term storage of a computer system, for example.
- some optical instrumentation can be sensitive to a dye shift of about 1 nm or less.
- laboratory instrumentation utilizing a relatively more robust dye matrix can be less susceptible to the spectral shift of an LED than a system with a relatively less robust dye matrix.
- the AB 7500 system available from Applied Biosystems of Foster City, Calif. can have a very good dye matrix and can have little susceptibility to spectral shift for at least most dyes.
- the LED radiation source can contain one Light Emitting Diode (LED) or an array of individual LEDs.
- each LED can be a high power LED that can emit greater than or equal to about 1 mW of excitation energy.
- a high power LED can be used that can emit at least about 5 mW of excitation energy.
- a cooling device such as, but not limited to, a heat sink or fan can be used with the LED.
- An array of high-powered LEDs can be used that draws, for example, about 10 watts of energy or less, about five watts of energy or less, or about 3 watts of energy or less.
- Exemplary LED array sources are available, for example, from Stocker Yale (Salem, N.H.) under the trade name LED AREALIGHTS, and from Lumileds Lighting, LLC (San Jose, Calif.) under the trade name Luxeon Star.
- LED light sources can use about 1 microwatt ( ⁇ W) of power or more, for example, about 5 mW, about 25 mW, about 50 mW, about 1 W, about 5 W, about 50 W, or about 100 W or more, each individually or collectively when used in an array.
- the light source can include a combination of two, three, or more LEDs, laser diodes, and the like, such as, for example, an LED that can emit radiation at about 475 nm, an LED that can emit radiation at about 539 nm, and an LED that can emit radiation at about 593 nm.
- the LED can be, for example, an Organic Light Emitting Diode (OLED) an inorganic Light Emitted Diode, that can be polymer-based or small-molecule-based (organic or inorganic), an edge emitting diode (ELED), a Thin Film Electroluminescent Device (TFELD), or a Quantum dot based inorganic “organic LED.”
- OLED Organic Light Emitting Diode
- the LED can include a phosphorescent OLED (PHOLED).
- PHOLED phosphorescent OLED
- Super bright LEDs can be used and can be arranged in a light array. According to various embodiments, separate LEDs or a packaged set of LEDs can be used in an array. Spectral emissions of the light sources can be effected by an operating temperature of the light source.
- OLEDs can be used as an array while being designed as a single part.
- excitation source irradiation source
- light source e.g., light source
- excitation beams emitted from the light source can diverge from the light source at an angle of divergence.
- the angle of divergence can be, for example, from about 5° to about 75° or more.
- the angle of divergence can be substantially wide, for example, greater than 45°, yet can be efficiently focused by use of a lens, such as the focusing lens 106 ( FIG. 1 ), 206 ( FIG. 2 ), and 306 ( FIG. 3 ).
- the lens can be a collimating lens, for example, a Fresnel lens.
- a quantum dot can be used as a source for luminescence and as a fluorescent marker.
- Quantum dots can be used for both.
- the quantum dot based LED can be tuned to emit light in a tighter emission bandpass, for example, an emission bandpass including a full-width of half-max of about 10 nm or less, about 20 nm or less, or about 50 nm or less.
- the quantum dot based LED can increase the efficiency of the fluorescent system.
- the efficiency of a quantum dot based LED can theoretically be higher than that of conventional LEDs, potentially over 90% when sandwiched directly between two conductive films with each film directly touching each quantum dot as opposed to the present 20% efficiency for standard LEDs.
- Quantum dot based LEDs can be made utilizing a slurry of quantum dots, where current flows through an average of several quantum dots before being emitted as a photon. This conduction through several quantum dots can cause resistive losses in efficiency. Quantum dots can provide many more colors than conventional LEDs.
- a Quantum dot based LED can emit light in an emission band that is narrower than an emission band of a normal LED, for example, about 50% narrower or about 25% narrower.
- the emission band of the quantum dots can be a function of the size distribution of the quantum dots, and thus can theoretically be extremely narrow.
- the Quantum dot based LED can also emit light at an electrical energy conversion efficiency of about, 90% or more, for example, approaching 100%.
- OLED films, including Quantum dot based LEDs can be applied to a thermal block, used for heating and cooling samples, in a fluorescence system without interfering with the operation of the thermal block.
- an OLED can be used and/or produced on a flexible substrate, on an optically clear substrate, on a substrate of an unusual shape, or on a combination thereof.
- Multiple OLEDs can be combined on a substrate, wherein the multiple OLEDs can emit light at different wavelengths.
- Multiple OLEDs on a single substrate or multiple adjacent substrates can form an interlaced or a non-interlaced pattern of light of various wavelengths. The pattern can correspond to, for example, a sample reservoir arrangement or array.
- One or more OLEDs can form a shape surrounding, for example, a sample reservoir, a series of sample reservoirs, an array of a plurality of sample reservoirs, or a sample flow path.
- the sample flow path can be, for example, a channel, a capillary, or a micro-capillary.
- One or more OLEDs can be formed to follow the sample flow path.
- One or more OLEDs can be formed in the shape of a substrate or a portion of a substrate.
- the OLED can be curved, circular, oval, rectangular, square, triangular, annular, or any other geometrically regular shape.
- the OLED can be formed as an irregular geometric shape.
- the OLED can illuminate one or more sample reservoirs, for example, an OLED can illuminate one, two, three, four, or more sample reservoirs simultaneously, or in sequence.
- the OLED can be designed, for example, to illuminate all the wells of a corresponding multi-well array.
- an OLED can be used and can be formed from one or more stable, organic materials.
- the OLED can include one or more carbon-based thin films and the OLED can be capable of emitting light of various colors when a voltage is applied across the one or more carbon-based thin films.
- Various LEDs can use different films, for example, quantum dot based LEDs can use Indium tin oxide.
- an operating temperature of an LED can be controlled with a Peltier-effect thermoelectric device, a heat pump, an electrical resistance heating element (Joule heater), fluid-flow through channels in a metal block, reservoirs of fluid at different temperatures, tempered air impingement, a combination thereof, or the like.
- the thermal device can include a fan to direct air-flow over cooling fins, or a cold bar to assist in a heat transfer between an LED and another thermal mass, such as air.
- the thermal conductivity of the LED and/or a platform supporting the LED can be greater than that of a surrounding ambient environment, for example, the surrounding air.
- thermoelectric device can be used as a heat-transfer device, for example, an XLT module available from Marlow Industries, Inc. of Dallas, Tex.
- Controls for the thermoelectric device can include an adjustable-bipolar DC output current power supply.
- the power supply can provide programmable PID control/ramp to set point control, deviation alarms, and automatic and manual operating modes.
- thermoelectric devices can both heat and cool, as desired, the LED by using a bi-directional power supply under programmable and/or logic control.
- the programmable and logic control can be provided by using a general purpose computer, or custom built hardware, for example, a field programmable gate array (FPGA).
- Thermoelectric devices can be specifically designed to withstand the continuous temperature excursions required in PCR use.
- a heat-transfer device can include a vapor-cycle device, for example, a Freon-based vapor compression or absorption refrigerator.
- a vapor-cycle device for example, a Freon-based vapor compression or absorption refrigerator.
- thermal energy can be extracted from a region, thereby reducing its temperature, then rejected to a “heat sink” region of higher temperature.
- Vapor-cycle devices can include moving mechanical parts and can include a working fluid, while thermoelectric elements can be totally solid state.
- a thermal interface material can provide a good thermal contact between two surfaces, for example, between an LED support and a substrate, and/or between an LED housing and a thermoelectric device.
- the TIM can include silicone-based greases, elastomeric pads, thermally conductive tapes, thermally conductive adhesives, or a combination thereof.
- Zinc-oxide silicone can be used as a TIM.
- Gap-Pad products for example, GAP PAD VO ULTRA SOFT materials or SIL-PAD, materials available from Berquist Company of Chanhassen, Minn., can be used as thermal interface materials.
- a TIM is described in U.S. Pat. No. 5,679,457 to Bergerson, which is incorporated herein in its entirety.
- a TIM can be disposed between a heat-transfer device and an LED.
- a method can be provided for maintaining emssion intensity and spectral stability of an LED.
- the method can comprise: providing a system comprising an LED; generating excitation beams with the LED; measuring an operating temperature of the LED; and regulating the operating temperature by at least one of transferring heat from the LED and transferring heat to the LED, based on the operating temperature, to maintain emssion intensity and spectral stability of the LED.
- the regulating can comprise retrieving from a memory source adjustment data corresponding to a desired operating temperature or temperature range at which emission intensity and spectral stability of the LED are maintained.
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Priority Applications (15)
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US10/981,440 US20050279949A1 (en) | 1999-05-17 | 2004-11-04 | Temperature control for light-emitting diode stabilization |
JP2007539342A JP2008519266A (ja) | 2004-11-04 | 2005-11-03 | 熱補償型発光ダイオードを備える、光学走査システム |
EP05849156.4A EP1807726B1 (fr) | 2004-11-04 | 2005-11-03 | Système d'illumination comprenant diode électroluminescente a stabilisation thermique |
EP20100075604 EP2306233A3 (fr) | 2004-11-04 | 2005-11-03 | Systèmes et procédés de balayage optique a compensation thermique |
US11/265,110 US7423750B2 (en) | 2001-11-29 | 2005-11-03 | Configurations, systems, and methods for optical scanning with at least one first relative angular motion and at least one second angular motion or at least one linear motion |
PCT/US2005/039839 WO2006052682A2 (fr) | 2004-11-04 | 2005-11-03 | Systemes et procedes de balayage optique a compensation thermique |
EP07120202A EP1890182A2 (fr) | 2004-11-04 | 2005-11-03 | Systèmes et procédés de balayage optique thermiquement compensés |
US11/644,410 US20070105212A1 (en) | 1999-05-17 | 2006-12-22 | Temperature control for light-emitting diode stabilization |
US12/222,820 US7599060B2 (en) | 1999-05-17 | 2008-08-18 | Optical scanning configurations, systems, and methods involving at least one actuator for scanning a scan head |
US12/895,848 US20110159549A1 (en) | 1999-05-17 | 2010-09-30 | Temperature control for light-emitting diode stabilization |
JP2010288958A JP2011059134A (ja) | 2004-11-04 | 2010-12-24 | 熱補償型発光ダイオードを備える、光学走査システム |
US13/619,679 US9285318B2 (en) | 1999-05-17 | 2012-09-14 | Optical instrument including excitation source |
JP2014024057A JP2014081391A (ja) | 2004-11-04 | 2014-02-12 | 熱補償型発光ダイオードを備える、光学走査システム |
JP2016002231A JP6050529B2 (ja) | 2004-11-04 | 2016-01-08 | 熱補償型発光ダイオードを備える、光学走査システム |
US15/065,834 US20160305881A1 (en) | 1999-05-17 | 2016-03-09 | Optical instrument including excitation source |
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PCT/US1999/011088 WO1999060381A1 (fr) | 1998-05-16 | 1999-05-17 | Instrument servant a surveiller l'amplification en chaine par polymerase (pcr) d'adn |
US09/700,536 US6818437B1 (en) | 1998-05-16 | 1999-05-17 | Instrument for monitoring polymerase chain reaction of DNA |
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US10/216,620 US7008789B2 (en) | 1998-05-16 | 2002-08-09 | Instrument for monitoring polymerase chain reaction of DNA |
US10/440,719 US7387891B2 (en) | 1999-05-17 | 2003-05-19 | Optical instrument including excitation source |
US10/981,440 US20050279949A1 (en) | 1999-05-17 | 2004-11-04 | Temperature control for light-emitting diode stabilization |
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US11/644,410 Continuation US20070105212A1 (en) | 1999-05-17 | 2006-12-22 | Temperature control for light-emitting diode stabilization |
US13/619,679 Continuation US9285318B2 (en) | 1999-05-17 | 2012-09-14 | Optical instrument including excitation source |
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US11/644,410 Abandoned US20070105212A1 (en) | 1999-05-17 | 2006-12-22 | Temperature control for light-emitting diode stabilization |
US12/895,848 Abandoned US20110159549A1 (en) | 1999-05-17 | 2010-09-30 | Temperature control for light-emitting diode stabilization |
US13/619,679 Expired - Fee Related US9285318B2 (en) | 1999-05-17 | 2012-09-14 | Optical instrument including excitation source |
US15/065,834 Abandoned US20160305881A1 (en) | 1999-05-17 | 2016-03-09 | Optical instrument including excitation source |
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US12/895,848 Abandoned US20110159549A1 (en) | 1999-05-17 | 2010-09-30 | Temperature control for light-emitting diode stabilization |
US13/619,679 Expired - Fee Related US9285318B2 (en) | 1999-05-17 | 2012-09-14 | Optical instrument including excitation source |
US15/065,834 Abandoned US20160305881A1 (en) | 1999-05-17 | 2016-03-09 | Optical instrument including excitation source |
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Also Published As
Publication number | Publication date |
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EP1890182A2 (fr) | 2008-02-20 |
JP2011059134A (ja) | 2011-03-24 |
EP1807726B1 (fr) | 2016-04-27 |
US20070105212A1 (en) | 2007-05-10 |
US9285318B2 (en) | 2016-03-15 |
US20160305881A1 (en) | 2016-10-20 |
WO2006052682A3 (fr) | 2006-08-03 |
US20130034859A1 (en) | 2013-02-07 |
JP2008519266A (ja) | 2008-06-05 |
WO2006052682A2 (fr) | 2006-05-18 |
JP2014081391A (ja) | 2014-05-08 |
US20110159549A1 (en) | 2011-06-30 |
EP2306233A2 (fr) | 2011-04-06 |
JP6050529B2 (ja) | 2016-12-21 |
EP1807726A2 (fr) | 2007-07-18 |
JP2016076501A (ja) | 2016-05-12 |
EP2306233A3 (fr) | 2011-07-20 |
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