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Chien-Chung Lin - IEEE Xplore Author Profile

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A 3628-PPI color conversion layer based on colloidal quantum dots is demonstrated with high resolution and good reliability. The sub-pixel size is 2 microns and the color conversion efficiency is as high as 22%. A properly designed mirror can enhance the peak intensity more than two times.Show More
In this study, we propose various methods to increase the colloidal quantum dot (CQD) efficiency in a packaged LED. The amount of CQD is much higher than the regular concentration with some of them over 40% of weight percentage. The microcarriers were applied to hold the CQDs and an 63.5% improvement of color conversion efficiency can be observed.Show More
We fabricated and demonstrated 2-micron InGaN micro LEDs. The devices can work with ALD passivation and exhibit high quantum efficiencies. As high as 7.36% of quantum efficiency can be obtained in 100-micron devices. The current-dependent emission peak shift can be seen as an indicator of device's thermal issues.Show More
An InGaN U-shape micro LED is fabricated and integrated with colloidal quantum dots. The extracted SRH coefficient showed a 3.2-time increase of surface recombination velocity, while the lifetime of the quantum dot layer is extended 16 fold due to less thermal stress.Show More
Considering the wavelength shift caused by quantum-confined Stark effect (QCSE) in red InGaN micro-LED, the simulation results herein indicate that the modified distributed Bragg reflector (DBR) can provide a 42% amelioration in color purity.Show More
The porous structured microcarrier powders were mixed with CQD/PDMS packages to improve the dispersion of CQD particles. When the traditional package suffers seriously in efficiency at high CQD loading, the microcarrier ones sustain its performance and win out.Show More
We demonstrated a semiconductor process based procedure to fabricate a high resolution colloidal quantum dot array. The color conversion efficiency can be as high as 17.9% and further enhanced 1.64 times by an additional DBR mirror. The vacuum storage time is projected to be 3523 hours.Show More
We propose a new method for fabricating arrays of colloidal quantum dots for color conversion layers (CCLs) with atomic layer deposited (ALD) encapsulation. Semiconductor processes were used to transfer the CCL onto a transparent glass substrate. This method enables pixels as small as 5 μm, and the pixel's size and pitch can be controlled through the semiconductor process and mask layout. A dual-c...Show More
We report the blue semipolar $\left( {202\,\bar 1} \right)$ μLED array which exhibited excellent optical-electrical characteristics and polarization performance. A high 3-dB bandwidth of 1.056 GHz under a current density of 2.5 kA/cm2 and 1.8 Gbit/s data rate were achieved in a certain free-space transmission distance.Show More
The PLQY of the novel face-down pumped package is increased 11.1% than that of the traditional face-up pumped package. However, the operation temperature of the face-down pumped structure has increased.Show More
Fine pixel (5-micron) array patterning of colloidal quantum dots is achieved via inkjet dispense and semiconductor processes. The vacuum storage lifetime can be as long as 12830 hours when a dielectric protective layer is on.Show More
We contribute our recent progresses in micro LED technologies for the AR/MR applications in the present study. The novel eye-tracking system based on infrared micro LED and small pith full-color micro display with colloidal quantum-dot conversion are revealed. By combining these results, it has potential for enhancing the experiences in the usage of AR/MR glasses.Show More
A colloidal quantum dot (CQD) package with convex-surface solder reflectors of various diameters exhibited more favorable thermal characteristics and optical reliability performance than did the traditional in-chip package. The results indicated that solder balls provided a direct cooling path on the top of the LED chip to accelerate heat dissipation, and blue photons were reflected by the ball su...Show More
This study fabricated and analyzed AlGaInP-based red micro–light-emitting diodes (LEDs) ranging from 2 to 15 μm in size. To collect photons from a single micro-LED at this scale, a solar cell chip near the micro-LEDs was used. Quantum efficiency decreased at a faster rate than that predicted by the standard ABC model under high currents, and a leakage current component was added to fully describe ...Show More
Validated both numerically and experimentally, Beam Propagation Method (BPM) has been proven to be a very efficient and reasonably accurate simulation approach for silicon photonics (SiP). This paper clears up some misunderstanding in this community that BPM is not suitable for SiP.Show More
A hybrid method was developed to fabricate a large scale array of colloidal quantum dots for micro LED integration. This method combines the merits of direct deposition and mature semiconductor processes. A color conversion efficiency of 30% was measured.Show More
We reported an InP-based photosensor with the thickness less than 3 micron due to the substrate removal process. A responsivity of 0.345 W/A was obtained at 850nm, and the extended operating wavelength in blue can be achieved by extra colloidal quantum dot coating.Show More
The Sn-ball integrated with the QDLED package are designed to achieve more effective heat dissipation. The thermal, luminescence and aging tests of this structure were evaluated and was proved that have good CCE and reliability.Show More
We report a 3-in-1 mini-light emitting diode and combine ink-jet printing technique to achieve a full color in monolithic chip. Finally, make reliability test by low-temperature ALD technology at 2020 color gamut of red and green QDs during 300 hours reliability test under 50°C /50% RH condition.Show More
We report a novel structure of U-shaped micro-LED to reduce the lateral leakage and explore the impact on QDs beside the quantum wells. Furtherly, optimize the utilized region of red QDs to reduce cost. Finally, make reliability test at 100 A/cm2 to make sure the usage region for red QDs.Show More
One of the prominent challenges for widespread adoption of silicon photonics (SiPh) technology is the availability of an integration platform that can simultaneously meet a wide range of power, performance, and cost criteria in different applications. As a result, there is a diversity of SiPh integrated solutions proposed or demonstrated, but none is considered as a common solution. In this paper,...Show More
A Sn-ball was integrated with a colloidal quantum dot light-emitting diode package to achieve effective heat and reliability management. The electric, optical intensity, and heat distributions of the package were evaluated under various radiant fluxes; data were collected at the 90th hour of aging. Under 1 W/cm2, the areal temperature decreased from 38.5 °C (without Sn-ball) to 32.3 °C (with Sn-ba...Show More
MICRO-LEDs ( n-LEDs) HAVE been engaged in the next-generation display technology and evolved for various applications from several electronics manufacturers and institutions. The area of n-LEDs (less than 10 # 10 nm2) is desired for the high pixelsper-inch (PPI) value of the microdisplay, but the sidewall effect from the etching process will drop the quantum efficiencyShow More